Fish breeding help?

You could try Aquabid, but don't expect to get rich off of it. Most folks just sell there to support their hobby. Large chain pet shops generally will 'take them off your hands' for free, but won't pay. I've heard some of the smaller shops will give you store credit at least. You should pick a fish that you generally like and want in your tank anyway. Then google about the breeding of it. You'll find a lot of posts on the more common fish. I've bred spotted blue eyed rainbowfish, panda cory's and threadfins. It was pretty easy. Just segregate a few males from a few females. Feed them lots of protein and live foods (if you can) for a week or two. Then put the boys and the girls together in a breeding tank and do a large water change with water that's about 8 degrees cooler than their tank. It makes them think that it's spring time which is when most fish and animals breed. Collect the eggs in spawning mops made from yarn and rocks or corks. Rocks for sinking mops and corks for floaters. Some fish do have a preference. Separate the eggs from the parents as the parents will often eat them. Going to try breeding my cardinals next. That should be a challenge. You have to keep the babies in darkness or near darkness for the first week or two of life. Wish me luck!