They are a pain in the rear to feed sometimes. You pretty much have to hand feed them, and they can sometimes be picky with foods. They can be sensitive to certain tank mates. For example, ghost shrimp will chew on them, and the frogs aren't very bright, so they will sometimes attack fish in the tank during feeding time.
If you're going to keep multiple in one tank, I would keep the typical one male to two or three female. Not that there is much of an agression issue, simply because it increases chances for mating. I woukd generally feed them glass worms, beefheart, blood worms, tubifex and mysis.
Typical water parameters have always been fine, 74-82 f, with clean water around a pH of 7.0 plus or minus 1.0
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