I am one who enjoys tinkering with things, just recently I had to make an underwater dry spot (cover picture) for my fiddler crabs at the bottom of my 55 gallon fish tank, as I said, being that I have to tinker, I got to thinking of how i could make the dry spot into an underwater greenhouse.  I have seen a few "natural" filters, basically a bunch of hydroponic plants, some nylons, PVC pipes, and a pond pump.  The idea is that you don't need a charcoal filter to clean the nitrates and nitrites from the water, the plants do that for you.  But that system is complex and boring.  I am shooting for an completely submerged greenhouse to do the same thing, and hopefully I won't have to buy charcoal filters left and right, thus cutting down on the plastic waste from the filter, and a nifty way to reuse jars. :D
Update: I have a plant beginning to grow in the underwater greenhouse :D

Quick list of things to gather:

Fish tank tubing
Glass jar with screw on lid
Anti-siphon thing
Regulator valve
Drill with small bit
Fish tank gravel

for my underwater dry zone visit here:

Step 1: Get a Jar, preferably class

Get yourself a glass jar, I personally had a grape jelly jar with a metal jar kicking around.  After enjoying many many pieces of toast covered in grape jelly, and the occasional peanut butter and jelly sandwich, I finally had an empty-ish  jar.  Just wash out the jar and the cover, let dry because the next step will be easier dry.
&quot;Terranium too boring? Why not add extra hardness by putting it underwater?!&quot; <br> <br>This still remains one of my favourite instructables to date. How are the plants and/or animals coming along?
sadly, the plants were to sickly looking, between not being able to properly adjust the air pressure inside to keep just the right amount of water in, and lack of light, they just didn't really have a chance, though with my new apartment and part of my 55 by window, this might take off... as for the fiddler crab that I built the original bubble for, I found him dead inside the jar, I am not sure if the bubbles coming out the mouth of the jar was to much (don't think so cause he would pop in and out at will) or if it was the fact that I threw a crayfish in the tank as well... on the positive side, the crayfish is doing awesome lol

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More by infernisdiem:Easy to Make apple dessert Build your own K'nex motor Under water Dry zone for fiddler crabs 
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