For a 5 gallon, You can probably do 10 CPD's. For a 10 Gallon....Eh I would say up to 20 CPD's.
They do great in tropical temperatures ranging from 76 degrees to 80 degrees Fahrenheit is fine;they should adjust;Same applies to the pH of your water. The usually prefer acidic however.If you are going to breed them, I suggest you use some java moss. The moss will be a great cover for eggs and fry. Good luck breeding Fishy_Fun! Because I'm doing the same thing you are doing! Within a few weeks.