Cladophora ball "Aegagropila linnae"

A marimo ball is a rare growth form of algae, which grows into large green balls with a soft, velvety appearance.they are native to japan where they naturally grow at Lake Akan. They are also found in Iceland ,Estonia and scotland. They can grow patches on a lake floor at depths from 2 to 2.5 m. The round shape of the marimo is maintained by wave action that turns it.
In Japan the marimo has said to be a national treasure.
They where named by the Japanese botanist "Tatsuhiko Kawakami". Mari means bouncy ball and Mo is a term for plants that grow in water. So , marimo means bouncy plant.People often mistake them for living animals because they are usually moving around in the tank.

I first saw marimo balls when i was looking for an aquarium, then I immediately wanted them!

how to grow marimo balls

Your marimo friends will grow in tap water at room temperature as long as the water is changed every one or two weeks.
The growth rate of Marimo is about 5 mm per year.they grow particularly large, up to 20–30 cm (8–12 inches).

All they need is normal household lighting for them to make food, otherwise, indirect sunlight is fine.
You should turn them over once in a while for them to keep their round shape.
Marimo's are actually VERY easy to take care of, probably one of the easiest plants that live in water.
you just have to change the water once a week and your done!" make sure NOT to have age killer in the water!!!!"
1* They do not float unless the water is squeezed out of them.
2* They are NOT moss, they are a very unique type of ALGAE.


They need little light, they do best with lamp light especially if you have smaller, rolled marimo.
if so, they will start to grow outward like they do naturally and look very fuzzy.

Health problems:
If your marimo turns grey then simply flip it over and make sure the grey area gets light.
If that doesn't not work then you can get a bowl, add water, ice and salt, let them soak in that for about 3 hours .

they are a VERY easy plant ( ALGAE) to take care of and are nice for people that want a plant but don't have the time to take care of it.
They are also a helpfull addition to to fish tanks, thus they act like miniature filters cleaning out the water.

please ask any questions!

My marimo is falling apart and turning brown and I'm not sure why!
Most likely it needs to be clean use fish safe water put it under the water and squeeze it
Can you show me some good pics of it?
<p>help mines floating how do I make it sink</p>
<p>how do i get them to stay on the bottom of my tank?</p>
<p>I don't know mine floats also</p>
<p>Goldfish are small members of the carp family and will eat algae regardless of its shape,round or otherwise. I would not recommend keeping them in the same tank.</p><p>To fix your marimo ball gently role it back into a ball shape with your hands. there are several YouTube videos that will show you how to do this properly without harming your marimo ball. even if your algae loses its ball shape it will most likely survive,because in the wild they grow as both a ball form and as a large mat on lake bottoms. Search <strong>&quot;How to propagate marimo balls&quot; </strong> and <strong>&quot;marimo ball care&quot;</strong> on youtube for great info.</p>
<p>Hi, I've had a marimo ball for a few months. I bought it highly reccomended for my fish tank to oxygenate the water. I have a five gallon tank and a goldfish. Recently my marimo ball opened up, and is getting less ball like by the week. Does my fish have anything to do with this? can I get it back to a ball?</p>
Hell no. Most of this information is wrong.<br>1) marimo need about 30 min intervals of sun for 2 hours a day. They need COLD (28&bull;-32&bull;) and it needs to be changed weekly.<br>2)if a marimo is grey, bathe it in cold water and gently remove the grey areas.<br>3) MARIMO NEED LOTS OF CARE! They can get depressed. They do need care, unlike what the entry says.<br><br>Proud owner of HEALTHY marimo for over 3 years.
Actually I have over 10 extremely healthy marimo balls ( including a grapefruit sized one) that I have had for over 4 years, and this is research from these last years.<br>They don't have to have light, <br> they can but it is not necessary.Marimo are one of the easiest freshwater &quot;plants&quot; you can have, and they don't get depressed, they are algae and not animals.
Couple questions.<br>What do I need to do at night for light do I need to keep one on?<br>How often do I need to make &quot;waves&quot; in the water for my Marimo?
Hi! Actually I have had marimo for over 4 years and they grow fine with minimal light because naturally they grow in deep water without light.And also you can just move the marimo around and its fine!
You can take them out and roll them. And at night you do not have to put light on them. And give them cold water. Trust me :) mine are healthy and happy.
Hi, I've been researching Marimos and would like to buy them. Are there any shops in Thailand which sells these? <br><br>Thank you
<p>Hi Jake<br>Yes if you go to chatuchak market. You will find Marimosa plants in the fish/pets section.</p>
Hello :3 I just got a moss ball yesterday as a birthday present. And I really want to take very good care of him. So I have questions to ask. So you can keep them in a jar with the lid on and they will be fine? They don't need air? And if I want more of them without hurting him? Like do they have babies? Like one day ill see a bunch of tiny babies next to it? And they will be fine if Iput them on a window where they will get direct sunlight for most of the morning or is that too much sunlight? Because I live down in texas where it gets really hot. I really want to take good care of my moss ball and make him big, fat, and happy. :3 so can you please help me? :C
Hello, <br>I will answer all of your questions! <br>they do not need air, so a jar with a lid is fine:) <br>they eventually break apart, forming two marimo or little baby marimo will start to form off of them. <br>sunlight is fine, one thing people don't usually realize is that they are algae and grow LOTS faster in warm sunny water!! <br>just make sure to take it out of the sunlight when it it gets over 80 degrees. <br> <br>please feel free to ask any questions!!! <br>you can lookat my etsy store :http://www.etsy.com/shop/Marimoinabottle?ref=seller_info <br>website: www.marimoinabottle.com <br> <br>thanks!! <br> <br>Alliah <br> <br>
Neetz I have 2 marimos ball.do you duplicate them by ourself or they will duplicate them self naturally?
<p>hi! I have just bought one, and its very little, where can I keep it? in glass or in plastic? </p><p>so,no direct sun light? here in Spain it can be quite hot!</p><p>thanks and have a great day!</p>
<p>What exactly is &quot;age killer&quot;? I use water conditioner in my tank for the fish, is that okay to use?</p>
I am new to aquariums and have seen others with these moss balls in theirs n they love them...i see them selling on ebay do you think its ok for my aquarium??
<p>I'm trying to cultivate some marimo from this instructable. I've been trying to find a good water flow to put them in to save me having to turn them, but I'm not having much luck. Originally they were in my main aquarium, which has a lot of current (basically a river tank) but they all ended up stuck to the filter intakes. So now I've put all the baby marimo into a small external filter with clear sides (and Eden 501) and put the filter in a north-facing window. Not much movement so far so I might have to turn them afterall.</p>
I purchased my first marimo ball but it has tiny clear creatures crawling on it and I'm afraid of killing them if I do a water change or roll the ball. What do I do?
Are they ghost shrimp? They are commonly put with Marino balls.
I think they are. They are very small. Almost can't see them. <br>Do I want them or not? If so how do I shape, touch or clean the marimo ball or change the water without killing them?
<p>Unless you have fish that might eat them, you can leave them be. They won't do any harm, and as neetz said they are often housed with marimo. Some people run tanks purely for different types of tiny shrimp. My sister used to have a shrimp tank with a variety of them in. They bred, and if you put your hands in the tank they would cover your hands and start to clean them. They were so tiny you couldn't even feel them doing it. Really interesting and kinda fun. :-)</p>
<p>I have two very healthy Marimo Balls... I've had them for over a year... each lives in their own bottle... and they are healthy green and have doubled in size... a friend sent me a dozen small Marimos for Christmas... they are in a larger separate bottle....however they are not vibrant green... they are a dusty light green...I'm concerned the were frozen in transit... <br><br>After reading your advice... I am soaking them in Salt Water for 3 hours and then getting them to a spot where they get more sunlight... I live in Michigan... it's still very cold here... but is there anything else I can do... They're not as &quot;HAPPY&quot; Looking as my other two... <br><br>My Healthy two are very fuzzy and very green... where the smaller ones are very smooth... Any other Suggestions????</p>
Do the healthy ones get more light?
<p>Here is my healthy one... in his private bottle..<br><br>And the babies... soaking in Salt Water in the Sunlight... :)<br><br>Notice how the babies are much lighter and smoother and less fuzzy! :(</p>
Hi my moss ball has a dent inside of her, is she ok?
<p>yes she will be fine just roll her and gently squeeze her every water change the indentation is probably nothing they all come in different shapes and sizes and let her have plant food fluval or seachem work excellently </p>
I have a question please, just bought a Marimo ball.. I keep getting white foamy bubbles that I think may be an algae bloom, My 25 gallon freshwater tank only has two Tetras left but because of favorable conditions for Malawi Cichlids I plan to change over to the African Cichlids, will the Marimo ball be ok for the Cichlids?
<p>Do you think the bubbles could have been eggs or some sort of nest? Cichlids have many diverse reproductive patterns including laying eggs in masses of bubbles, or sometimes the eggs themselves look like bubbles. Also, Africa is an entire continent, and most cichlids come from there already (including and most notably the mbuna cichlids you already have; I'm assuming that's what you mean by malawi cichlid). If you're being sold something labeled just as &quot;african cichlid&quot;, you really won't know what you're getting and could get stuck with an aggressive species or one with requirements you can't accomodate.</p>
<p>they will be fine just rinse them out every water change and lightly squeeze them out making sure you circulate them around to keep then nice and round and happy they absorb a lot of the ammonia and nitrates and nitrites from your fish also every once in a while it's good to give them plant food like the fluval plant micro nutrients they love it </p>
Hello!!! <br>I do quite like Cichlids! I think they would do fine with them! <br>the fish really don't &quot; eat&quot; them if that is what you are worried about:) <br>they normally just push it around. <br>I have a plecostomus that I thought would eat it but he likes to play with it! <br> <br>you can post a pic of the white bubbles if you would like! <br> <br>please feel free to ask as many questions as you want!!! <br>Alliah <br>
hello I have 5 mini marimo balls and 3 bigger one, I just bought them, but I really like them already! in few months I have to go in Italy and I need to bring them with me... how can I bring them? will they be upset if I made them fly twice a year? <br>thanks, marcella
and how frequently do they reproduce themselves? <br>do you divided them in pieces or you let them divided by themselves? <br>
<p>let them divide by themselves naturaly the will be all the more happy for it </p>
Hello, I think they would be fine to fly many times a year! <br>I would put them in a plastic bag with a little water and use a rubber band to keep it closed while there are flying and just put them in an empty jar with water while not. <br>I do divide mine and roll them so they are in a ball again.you don't have to, ,however, they don't split in half very often but they are very hearty plants! <br>thanks for your interest! <br>if you have any more questions just ask!
thanks for the help!
Hi, I just bought my Marimo recently. They are place inside a bottle with a cap. Should I remove the cap off? Also, I notice that some of the green fibers are floating around the bottle already. Is my Marimo in poor health (they are also not floating)?
<p>the fibres just mean there happy as can be </p>
your marimo are fine! they give off the fibers naturally, mine do that like crazy! <br>you can keep the cap on as long as you change the water at least once a week. <br>for them not floating,the truth is that they will usually only float if the water has been squeezed out of them. <br> your marimo would be brown-yellowish it it was not in good health. <br> <br>please feel free to ask any more questions!:) <br>thanks!
Thank you for replying, it helped ! :D but, in the parcel, wouldn't it recieve no light ??(I'm sorry, i couldn't reply to previous post for whatever reasons..)
<p>there a very hardy plant as they live in the depths of lake akyna in hakaido Japan they will be ok </p>
It would not receive any light but it would not die. <br> <br> <br>thanks again! <br> <br>
<p>Thank you for all the info but I have 2 question I have a female betta fish would it be ok to but the moss ball with the betta?[its only a one gallon goldfish tank] Also I have a moss ball and it produces little white thin strings what does that mean im a little freaked out!?!</p>
<p>You can put a moss ball with the beta, its good for them, i have one with mine and it has little strings coming off occasionally its nothing to worry about just turn it around </p>

About This Instructable


94 favorites


Bio: I love to make things! I am constantly finding new things to make and do. I love geeky stuff like Sherlock and doctor who.
More by neetz: Dragons egg necklace DIY upcycled forest heels how to make a " dark knight rises" bat sign bracelet
Add instructable to: