I use to raise and breed African Cichlids.
Very rewarding.
I had the Lyretail cichlid's breeding and I traded the young in every 6 months or so. I negotiated a price in turn for dry goods, food, tonics, etc. It was a lot of fun. My aquarium was a 70 gallon long profile tank featuring lots of rocks, caves and crevices. I remember that my Lyretails liked to lay eggs in 3" plain, clay flower pots that were on their sides. The Lamprologus, (can not remember exact spelling) used rock crevices as nesting sites. Really cool!
I also tried Electric Blue Cichlids. they were in another tank, a 125 gallon long tank. I was never successful in breeding those. They were a bit more pricey then the other 2. I bought four juveniles, one turned out male, the other three female. But they were so demanding in terms of water chemistry. Never worked out.
But the Lyretails bred like rabbits!!! I want to say that they yielded about $300 dollars a year in trades with the local fish store/pet shop.
Wonderful hobby. Gave it up in 2009 when I moved to Florida.