I have a 55G soon to be 75G Mbuna tank in my home office. I have a lot of rockwork, swim thru areas, etc. I have had them for 4 months from the time they were 1-1/2"s. Anyway, they have always flocked to the top of the tank everytime in come in the room, stand up from my desk, or move toward the tank...food grubbing little buggers
. Just yesterday, when I walked into the room, they scattered to their hiding places like they were freaked out. They are now coming out while I'm sitting at my desk, but when I stand up, they are gonzo immediately to the rocks. I don't know of anything that happened that would change their behavior so dramatically and so quickly?! Anybody have this happen to them?