Back in the late 80s I had a normal strain, spawning pair of managuense, each time they spawned, a small portion would be plain gold, another small portion of the spawn would be darker than normal, most of the spawn normal. Both of these different morphs tended to stand out, and unless I removed them from the tank quickly, were usually eaten by their brothers and sisters.
I grew out a few, but found without the normal markings, they looked like a very generic Parachromis.
I did not find that interesting.