get one of those big ones that look like a clamshell for the bottom of an aquarium. big disk with a plastic bottom. get the biggest one you can. voila. like 10 bucks max from any pet store.
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gonna go to the store n get sum hygrozyme today cuz the roots of plant a are Not looking very shabby.. also bought a round air stone, but it doesnt seem like enough right now, prolly get another one while im down there.. F*CK that tube that didnt stick to the bottom damnit