so I've heard!! I've got a sponge filter, so that's set, and I have plenty of moss / other plants for them to hide in. and I'll be adding a java moss wall as soon as my last shipment of java moss arrives (any day now...). i do have guppies in the tank, so i'm sure i'll loose a few to them, but they seem to all get along great. when i first added the RCS to the tank, they were tiny, and it turns out that all of them survived. that was a good start =)