I set up my chiclid tank about a month ago. I have three Kenyi (2Blue/1Yellow) and a Rusty. The yellow Kenyi quickly became the dominant fish in my tank. He swam very smoothly and chased the others around.
Just recently the yellow Kenyi has lost his appetite and developed a head shiver/quirk problem. The guy at the fish shop suggested I feed them live brine shrimp to induce appetite (which worked). However, the yellow guy still doesn't seem 100%. He has lost his dominant behavior and still quirks.
I also noticed the other fish starting this weird shiver/quirk behavior as well. What the hell is wrong with these fish? This can't be normal, can it?
No physical fin rot or white scaling is present - seems to be a behavioral issue. Maybe an intestinal parasite? Any advice?