I have no idea, myself. i think it's something that happened at the breeder when they were tiny
all 8 are doing great btw; they munch on the foliage (plenty of that), they interact great with my small nourissati's and they're incredibly tame......
they remind me of 8 fat little "bees" with their banded pattern.
I'm being a bit conservative with the feeding, since it's aherbivore, sort of, so they're not getting the whole spectrum.
mostly OSI spirulina flake, some cyclops, some mysis, regular flake etc
I skip the mosquitolarvae, mollusk meat and artemia. my experiences with grazers and herbivores is that those are risky
my larger Mada's however eat anything, but I never kept a more piggish bunch of cichlids like those.
I think a large Paretroplus or ptychochromis definitely qualifies as a scaled trashcan
so fgar the plants in the tank with the canarensis grow a lot faster that the fish can eat them and unfortunately they skip on the filamentous algae. the L144's -in there for windowcleaning- are also a lazy bunch, probably all that spirulina-based food.
"And he piled upon the whale's white hump the sum of all the rage and hate felt by his whole race. If his chest had been a cannon, he would have shot his heart upon it"