oh lol, sry
for me the following fish have made ma alot of money:
Guppy
Blue Ram
Platy
Mollies
i would think that the following would make you a fair bit also:
Discus(might be expensive to start with but you could certainly get a fair bit each for the little critters if you have good types of parents, such as blood pigeons etc)
other cichlids(such as firemouths, flags, mbuna, malawis etc which tend to have quite alot of fry)
killies (generally easy to breed, harder to raise the fry, and hard to find in the first place, i am having a crack at these soon, but you could certainly make a fair bit off them)
i no there are others i jst cant think of them right now?? brain musnt be completely switched on??
Shae 250