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My 5 gallon tank has nematodes, seed shrimp, and copepods, and I'd like to know if they'll get out of hand, with me just having cherry shrimp and otos.

I don't really have the room in my tank for more fish--would bladderwort keep them in check? Something like Utricularia graminifolia? I've been reading up on the plant, and though it's not for certain, it seems in most cases their traps are too small to suck in shrimp fry, though I hear UG doesn't like heat. I also know to avoid U. gibba, U. inflata, and U. olivacea, since they're pretty invasive.

Ideas, opinions?
 

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All of those are opportunistic detritovores. They bloom when there's an excess of stuff for them to eat, such as mulm or uneaten food. Easiest way to control them is to feed less, and honestly if you've got a good amount of biofilm you shouldn't have to be feeding shrimps that much anyway. If they don't bother you there's not any particular reason to get rid of them since they'll help break down waste in your tank, but if you don't like the look of them they aren't toxic or anything so you could net them out and feed them to your other fish.

Personally, I have daphnia and copepods in my shrimp tank and don't mind them at all. When they get out of hand I feed them to my mollies, but most of the time I just leave them be. Makes a convenient backup in case my primary daphnia culture crashes.
 
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