Introduction: The $10 Hermit Crab Tank Humifier

Picture of The $10 Hermit Crab Tank Humifier

Hermit crabs, super fun, easy pet right? Well, if your like me, you spoil everything you ever deem your pet. In which case, I couldn't keep my hermie tank's humidity above 50%. I guess keeping my room a constant 75 tends to dry out the air. So I went to the pet shop to see if they had a humidifier for the tank, and they had nice expensive humidifiers that seemed to puff out mist instead of just keeping the humidity up. So brainstorming in the pet store (and a bit more at home) I came up with this.

Step 1: Things You Will Need

Picture of Things You Will Need

You can get EVERYTHING and I mean everything at wal-mart.

1. Aquarium Pump - I got mine for $15 but I paid extra for quiet since it's located in my bedroom. You can get an aquarium pump for $7
2. Aquarium Hose - $1
3. Air Stone - $.50
4. Jar with plastic top $1

Items in your home you will need (or you will have to pick them up)

Hot glue gun
glue sticks
drill or something to poke pencil sized holes in your lid

Step 2: Assembly

Picture of Assembly

1. Drill 2 holes in the top of the lid. Just a smidge wider than the aquarium hose.

2. Feed hose in to the lid as shown in the picture below.

3. Cut the hose into 2 sections. On mine, I had one shorter and one longer as to accommodate placement of the humidifier and tank.

4. Attach air stone to the shorter of the two pieces inside the lid. making sure that the air stone hose is long enough that when the lid is sealed the stone is about 1/4" from the bottom of the jar.

5. Glue around the hose to keep them in and make it air tight. This is important.

6. Attach hose connected to air stone to aquarium pump.

Step 3: Plug, Pump and Ready to Go!

Picture of Plug, Pump and Ready to Go!

Feed unadorned hose into tank, fill with water, close lid and plug in.

The bubbles cause the air in the jar to become moist, then the moist air is pumped directly into the tank! Simple and works well!


Sunbanks (author)2008-03-07

That's a good idea! My hermit crabs ran away....Twice...I found them both times though.

JeanneR15 (author)Sunbanks2017-12-16

o.O Ran away? How?

Forevermylove25 (author)2015-02-20

I have three hermit crabs and I heard them speak for the first time this morning which I almost mistaked for my dog whining. It but made me happy and scared me cause I haven't heard them speak but It made me think what if they are in pain and that's why so that's why I looked this humidifier. I've been a little afraid it hasn't been humid enough for them and I don't have a way of checking how humid it is in the tank but I try to keep water in there but they also don't move around much so I think this may be my problem. So thanks think I'll try to make this once I get some cash.

:) They can be rather random about it. They will on occassion chirp for any random reason, either they can be very happy and comfortable or they may be chirping because they're distressed or even because they're having a dispute with each other.

ive had my hermit crabs for a week now and i havent heard them talk? what does it sound like

FlyingSquid made it! (author)2016-06-10

It has helped, but not as much as your Instructable says it does. I am, however, using a smaller pump than yours (I had it laying around and didn't want to spend money that I didn't have to). It has kept the humidity 10-15% higher on average, though.

I used a Rubbermaid container with a snap lid because I thought it would be easier to refill instead of taking the whole lid off every time I needed to refill it. Not sure yet if that is contributing to poor performance.

Crabby Witch (author)FlyingSquid2017-11-24

I think you havea the correct idea with that drinking cup. easy to fill and you dont have to move or fuss with the tubes. I dont see why it would work any different.

khrystal.williams.3 (author)2015-02-22

so with the 2 hoses, one is connected to the air stone one end and the other end is connected to the pump.. but why is there 2 and what is the second one connected to. do oyu put the jar in the tank?

The smaller of the 2 hoses, goes from pump, into the lid and that piece has the air stone connected to it. All one short piece. It introduces the air, softly to the water. The second, length of the 2 hoses, goes from inside lid, to the tank, that piece is as long as you need it to be, to reach your tank, TOP. it should go inside your tank rather toward the top to then blow in cool, moist air. Try to keep the food on the other side of the tank so it will not become to moist to fast and rot. Do not place this hose into the water, your not looking for another bubbler. This whole process should help with the humidity in the tank, if your lid is solid and not a wire grate it will. personally just have a salt water pool with a bubbler in that directly and the crabs go swimming and it keeps the moister and there happiness up also. I have my fresh water set up as a fountain. My crabs live in a mansion/castle.

I think one is connected to the pump and the other one is in the tank

Forevermylove25 (author)2015-03-01

Well it was kinda a high pitch chirping sound. I thought it was my dog whining so im still not quite sure if it was really them or not but it came from that direction and I was too afraid to get up and look in case they stopped.

NikkiM66 (author)Forevermylove252017-02-04

hermies chrip to establish dominance, mate and just socialize. it is kind of odd but it means they are happy!

HarmonyN (author)2016-08-04

Question: with the second hose (the one that feeds into the tank), should the other end rest in the water in the jar or above the water in the jar?

halo99 (author)2009-04-22

I would just want to say that you got the prices WRONG! yur instructables is perfect but the air stone is $1.50 the jar is $1.85 and the hoze is $1.50 the pump is the only one with the correct price...I put the humidifier together and my hermit crab is very happy and is walking around more! than you very much! p.s. i named my crab joe because i got him from joes crab shack! lol

AnitaW3 (author)halo992015-07-31

@halo99 - No where in your thought process did you consider that PRICES VARY FROM STATE TO STATE ? OR even where you buy them? walmart vs. petco for example !!?

HermitGuy101 (author)halo992009-11-25

joes crab shack? i didn't know they sold hermies there! You shuld get your little guy a partner though.

ftiger (author)HermitGuy1012012-09-20

Hey! I subscribed to your Youtube channel. How do you disinfect rocks from outside?

zackatron (author)HermitGuy1012011-03-09

do you need all the extra air hose like in the picture

halo99 (author)HermitGuy1012009-11-27

what do you mean by 'partner'?

HermitGuy101 (author)halo992009-12-03

A "Buddy." basically another hermit crab.

Royaljoy (author)2015-07-12

Can you use a mason jar instead?

casondra prieto (author)2015-01-02

Your humidity is too low. I have a 50 gallon tank with 7 crab and I keep it up at 80℅

Tigergirl1431 (author)2013-10-26

I just made one today, and it works well so far. Thank You!

mgerges1999 (author)2013-03-20

I have created this, except without the air pump. It is helping, but it goes up and down...not steady at night...

TN777 (author)2013-01-27

I made this last year for my 3 crabs: Speedy, Hermie and Daredevil. Daredevil is a girl(?) and the other two are male. This is the instructable that inspired me to join. Thank you for publishing this. My hermit crabs thank you too, their crabitat is much better now!

ftiger (author)2012-09-20

Do you need an airstone?

mr.krabbs (author)2012-03-02

I need help pls :(

I found a hermit crab thrown out from the third floor of a house which was owned by a child.
The hermit crab's shell was torn in two. leavin the middle part (his head part) exposed and his claw got stuck in his shell opening and the other end on the other part of the shell.

I took him home since i couldnt bear to see this guy so helpless.
I need help from you ppl so i can take care of it.

I soaked him into a tap water with salt, but then i read that its bad cuz of the chlorine. so i soaked him into a distilled water. now i took him out and placed him into a bucket. I dunno what to do.. pls help me. :(

I just want him to survive the night until i get back from school tomorrow noon. then i would buy a crabitat for him. but as of now, i dun know if he can survive the night. i live at the tropics btw.

poopcrab1234 (author)mr.krabbs2012-03-03

get a 10galloon tank get 6 inches of sand get food salt water and regular nmo chrolirne and get him stuff to play with is a list of things u need for habitat and a heat mat and get as many shells as u can so just in case if he or she hates all of em will at least pick one and then for the shell how adn use tape in fix other parts of shell reverse side of tape not sticky and lay out so tape not stick to table and patch them together and tape on crab shell and that should make so his empty shell area should be covered

knexfreak32 (author)2011-11-20

cool built one for my snails. good ible too.

cday6 (author)2011-08-04

your humidity was low because of the habitat you have them in. i have 6 hermits in a 20 gallon, and have little problem with humidity

SIRJAMES09 (author)2011-07-21

that's cool!! you did good Ma'am. :) TY for sharing.

nibbler125 (author)2011-05-12

I use a glass tank and as long as i keep the substraight moist it wont drop below 70%

zackatron (author)2011-03-09

you should get a sealed aquarium or rap that cage in suran rap to lock in humidity

that would make it way way way to humid and the hermit crap would not be aple l to breath which would make it die

lizard5431 (author)2010-08-16

Why the heck is there a sign that says "I love you Jen" below the desk/stannd for the cage.

'Cause he loves jen, stupid! ;) Alot of people put "semi-subliminal" love messages in their 'ibles. i'm sure you have without realizing it...

shawntherobot (author)2009-10-05

my first hermit crab i had ws missing hs claws i dindt notice till i got but after two weeks it died( it didnt eat anything)

Silver Buttons (author)2009-06-24

I couldn't get this to work! No moisture seems to be going through the tube into the tank. So, I stuck the bubble stone into their water dish, instead. Now they have a salt water jacuzzi! _

HermitNewbie (author)2008-06-07

does this completely solve the humidity problem? and does it matter where the end of the hose goes into the aquarium? I just got my first hermit crab a few days ago, and I'm reading everywhere online how I'm suffocating my crab because the humidity isn't high enough!! D:

I have four hermies, and the humidity in their tank is usually at 70-72%. They seem to be doing fine, but I do think they would be more active if it were higher, say at 75-80%. Do you have a moss pit in the tank? To make one, you can buy a plastic shower caddy and fill it with moss. The caddy is like a clear plastic bin that holds shampoo, etc. and it has big suction cups attached--it's about $6 at Wal-Mart, look in the bathroom section. Buy some floral moss at Wal-Mart also (craft and flower section), soak it in sea-salt water, rinsing out some of the dirt, and place it in the caddy. Stick the caddy onto the side or corner of the tank. This will add humidity to the tank, add a second level, and also give the hermies something to burrow into. Also, if you have only one crab, get a second one. They live in huge colonies in the wild and prefer to have company. :o)

slimlady52 (author)2009-06-24

you can't keep humitiy in your pen because its a pen you need a closed in container like an aquirum to hold the moister in. look up hermitcrab association web'll see!!!!!!! hope this helps

taylrock (author)2009-05-25

what about BEACH crabs???

also I found these Instructables that help with other good wildlife stuff:

traventm (author)2009-02-18

WOW! Thanks for this! It works great. My hermies were definitely NOT happy guys. I keep them in my computer room (the fans keep it high enough temp for them) but in the process the air dries out. Not wanting to put a full size humidifier in (computers and humidity don't mix) I made one of these following your instructions and now it's a balmy 80% humidity in their aquarium case. Now they're all over the place, zooming around, and just seeming much more active. Thanks!

Chris0000 (author)2009-02-07

Just a little side note! I don't think he's keeping the hermit crab in a wire cage! No hermit carb is going to be running on a wodent wheel. It is possible for people to have other pets, come on now....

Daethian (author)2008-12-23

Unless you live in a place that hermit crabs live natively, they should not be kept in a wire cage. It is impossible to maintain a constant, level humidity with a wire cage. A glass tank and solid lid is your first step in maintaining your humidity. Great idea for creating a humidifier though!!

chuckr44 (author)Daethian2009-01-19

I agree. You have made an excellent low-cost humidifier. The problem here is your wire cage, letting all the humidity out.

Tarantulady (author)2008-09-09

Who lives in the cage in the background? :)

me abd bilo, anyone whos seen borat will know what im talking about.

Squirrelfriend (author)2008-09-29

Great Idea! A commercial version costs around 40-50 dollars. I made one for about $5 works great. My two buddies Captn and Hank are a lot more active now that I can maintain a good humidity level. Thanks again.

LadyMadonna (author)2008-08-25

THANK YOU so much for this! Here's mine:

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