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They are a great fish, but not really that great for a community tank. They are fin nippers and can become quite aggressive to other fish. Do not keep with ghost shrimp.
They are sensitive to tank chemistry, more so than most other fish, so only add to established tanks. They also generate alot of waste, so keep the tank clean with water changes. I had 5 in a 10 gal tank, and that was just about perfect.
They will probably not eat flake, no matter what the fish store says. Some will only eat live blackworms or brine shrimp. Some will also eat frozen or freeze dried, but I wouldn't count on it.
One or two in a planted tank will keep the snails under control. They cannot eat any snails larger than their eye, so you will have to remove any larger ones from your tank first. With larger ones, they will harass and pick at the fleshy parts of the snail until they kill it. They will be unable to eat it, and the dead snail will foul their water.
I loved keeping them, but make sure you can provide the fresh food.