Nuetral pH and moderately hard water would suit them, how many per tank depends
on how big they are and how big they'll get. I keep a small species that only
get to be about the size of a quarter, I can keep as amnhy as 12 of these in a
twenty gallon tank.

Moon
remove nospam from e-mail to send to me, I grow trees in aquariums like bonsai.
I breed dwarf crayfish, great for planted community tanks. If you can get me a
shovelnose sturgeon fingerling (Scaphirhynchus platorynchus) no wild caught
please, contact me