My fish store just got these guys in. I have wanted them for as long as I can remember, but I could never find them. Now I not only found them, but I can get them for 3 bucks a piece. My questions are: 1) Are they ok in high PH and moderately hard water? 2) Do they have any special food requirements 3) How can I sex them, and how can I breed them 4) how many could I put in a 10 Gallon, and how many can I put in a 5.5 gallon?