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Help, 2 of my trillenetus have died tonight and both had bulging eyes. A third one has the bulging eyes but is not dead yet. What in the world has happened and how do I fix it before it gets to any more of my corys?

I would use some antibacterial medicine like Primafix or Furanol.

I think these symptoms often comes from bacterial infection.

I have Erythromiacyn, will that work?

I am not familiar with Erythromiacyn, so I can't say for shure.

is it "pop eye"

http://www.flippersandfins.net/pop-eye.htm

http://www.fishlore.com/aquariummagazin ... popeye.htm

Both links have some treatment info. Good luck.

Thanks for the help. The sick one is looking much better today. Hopefully he will continue to improve.

This pop eye is a difficult to impossible disease to cure. I would isolate all the affected fish and treat them there. Prognosis is not good regardless of what one does. Isolating diseased fish is the best way to limit the spread of it to the others.