Popeye

The first thing you need to do is check your water quality.

How long has the tank been set up?

What are the water parameters?

What is your usual tank maintenance routine?

What size tank is it?

What species are you keeping?

Eye issues are usually contributed to poor water quality or injury, so all of these questions could apply to your situation.

The best way to treat them is with frequent (sometimes daily) water changes and Melafix. Should the fish worsen or begin to refuse food, antibiotics may be required, but without knowing more, it's impossible to direct you.

Kim

There are very few cichlids that are going to get along and play nice in a 10G tank for very long, so aggression may play a part in what is going on. Do you know what species you have?

Were there fish in the tank for the month it was set up before you added the cichlids? If not, you're tank wasn't cycled properly, and the bacterial changes your tank is going through right now could be very hazardous to your fish.

So, basically, you may have more than one problem at this time.

How are you measuring a "stress level"? If you're seeing aggression, a larger tank is in order today. It won't take 4 cichlids long to kill each other in that small space.

Could you list the exact water parameters?

Kim