I might get a 29 gallon and would like to get fancy guppies to breed, can I just add in a bunch of hiding areas for the fry and have them breed? and how many can I put in? I was looking at 20 or so, I was going to get tanganyika cichlids but everybody was saying I can only keep a couple in there, but I want around 10 so I think I'll go with guppies, would they breed in there?