Hi everyone, First I want to thank everyone for the responses to my post. It's been a tremendous help! Here's an update on my tank situation:
I took out the remaining fish in my 120g and put them in 10 g tanks and treated them with Maracyn Two. Most of them recovered and they seem to be back to normal health. In the 120g, I did a 50% water change, treated it with Epsom Salt, let it sit for several days and then did another water change. At that time I put the fish back in and so far they seem to be doing okay.
Now, here's what's odd, I had a fish suddenly die in my 55 g. He didn't seem bloated or have anything visually wrong with him so I just moved on from that. Well, a week later, I noticed my buffalo head was breathing heavy and bloated. Sure enough, I put him in a 10g tank for treatment with Maracyn Two but it was too late and he died. Now I noticed another fish in the 55g tank breathing heavy but visually she looks okay. Additionally, I have a 2 1/2 gallon tank with fry in it. I've done nothing different with this tank and suddenly everyday I wake up a fish is dead. I've completely changed the water with water from a good tank and still the same thing; a fish dies everyday. I even started adding Armetiss by Microblift to it (just a couple drops) because a couple of the fish that died looked like their eyes were bulging (not sure if that was because they were dead or if they had pop-eye.). The fish visually look healthy. But the other odd thing is that the only fish dieing in this tank are electric yellows and not the peacocks in there. Not sure if this is coencidental or if maybe the electric yellows had some type of birth defect. Very odd.
It seems that the issues I'm experiencing are bacterical in nature because I've had some fish come down with other bacterial diseases such as pop-eye and fungus. I just don't understand why now I'm having this problem. The tanks have been in such good health and then all of the sudden all my fish are sick and I really don't think I've done anything different in the maintenance or whith feeding. The only thing that is different is that it is summer, it's very hot and I don't have central air so the tanks are running a much higher temperature than normal, around 85 degrees (even with the heaters turned off). So my question is, is the high temperature what is creating bacteria in my tanks and making my fish sick? That's the only thing I can think of. Also, I've heard Epsom salt is really good for treating tanks so I thought it might be good to treat my 55 g that I talked about above with Epsom Salt. If so, how much do I use and can I keep the fish in it while I do the treatment?
p.s., all of my fish are African cichlids either from Lake Malawi or Tanganyka