There's been lotsa controversy about cichlid hybridisation in the Aquarium hobby.

Most 'purist' cichlid enthusiast frown upon the idea of hybrid cichlids because the hybrid species is neither here nor there and in some cases the hybrid produces fertile offspring.

While in the wild, a texas and a convict cichlid would be geographically too far apart to breed (Thus no naturally occuring hybrid of these 2 fish could ever occur), this isn't the case in the aquarium. Basically, the idea is that hybrid off-spring could look very much like either parent and be mistaken for a particular species. This hybrid fish could then be used to breed with other pure blood cichlid and taint the pure species.... If this were to go on unchecked, we could eventually end up with cichlids that could not be identified. (Neither Texas nor Convict cichlids but a mismatch.)

To put it more bluntly, hybrid's are like a forced mix of 2 distinct species (don't confuse this with distinct races... a race is not a species.). A hybrid cichlid is somewhat like a man and chimpanzee mix. Both are primates (same genus), but distinctly different 'species'. Would we frown upon a man/chimp hybrid?

This is the argument put forward by cichlid purist and hence why many cichlid hybrids such as the 'flowerhorn', Angelfish and Discus are frowned upon by the purist cichlid enthusiast.

...... I could stand on both sides of the fence and debate this till the cows come home, but I'll leave it at that.