Here is the thing, it is one thing to have a pair of fish breed, take it from me, i currently have a breeding pair of yellow watchman, maroon clowns, bangaii cardinals, and green chromis. Now raising the fry and larvae is another story. it requires many hours of dedication and plenty of extra equipment, space, money, etc. I have had my fish breeding on a regular schedule now for some time (6 months for each pair or more) but the cost of raising the fry and larvae is just to much at this point in time to even consider. I work 14 hours a day 6 days a week, and besides regular maintanence i have little time to enjoy my tank these days (new job) so i dont know if your question is which fish are easy to breed or which fish are easy to raise.