A couple of months ago I lost two electric yellows to dropsy. this was followed by a round of pop eye in the other cichlids in the tank. Only one of them lost an eye. One of the fry from the second breeding. The pop eye recently cleared up when the water temp dropped below 26 c. And only the cichlids were affected. None of the other species in the tank showed any signs of being infected. Ammonia levels are at 0 as well as nitrites. I have to get a new test kit for nitrates. I read that pop eye can occur in association with dropsy. I've also read that pop eye is usually a sign of toxic conditions. Such as copper or from supersaturation of gases in the water. But why is it only the cichlids that are affected? I'm leaning towards bacterial problems. The fish are spawning just fine. I have had 4 spawnings from one pair, one from the red zebras and I've even had one form the lemon tetras. And oh the blue crayfish also succesfully reproduced. (Cichlids love 'em). Any ideas on what could be going wrong?