Agree with the post, don't do it for the money, you won't have the joy of doing so.
Discus are hard and are not for beginners.
Severums are easier, but are plentiful.
Red terror are hard get get.
Frontosas are a study breeder.
Malawi peacocks are good breeders but arnt popular and only males sale.
If I was to do it for $$, I do the electric blue Jack demsey, some odd reason
those fish always deman such a high price.
I'll put a fork in mouth about flowerhorns!