There's not a lot you can do with crayfish. Sooner or later, they will eat anything you put in the tank. There're a couple of things you could do to keep them from mowing down your plants or at least make that snot such a bad thing. One is plant with Vals and or sags. Get a good grassy mat of them going and them put your mudbugs in there. The other is to use floating plants, like hornwort. Or get a dwarf lily going with a good bulb and root system.
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