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I noticed today 2 of my Cories (C. Trileanatus) had a perfectly round, looks like an egg..clear..thing..just outside of their gill cover on the left side. I say two.. I think there were two like this..but I have 9 total, plus 3 C. Elegans, so it's kinda hard at feeding time to count.. At first I thought it was food that went throught the gills..cuz that's where it is..but NO oddly, if it is on more than one fish, and I think it is..it's always on the left side.
Any ideas? Ever picture I take, light reflects off the "thing" making it blend in with the cory's white..
Parasite?
if so, can I get something and mix in a 5 gal bucket and put them in for awhile to get rid of it? (this is a planted tank)

is it ich??

Haveyou done any BIG water changes lately, or had a major fluctuation in temprature? I've read in a few places that cories can develop water blisters from large changes like these.

No big changes. Not ich. It's bigger than ICH and clear.like a blister. Although,not perfectly clear today maybe. I've read about "gas bladder disease" where they get a blister like this .and it gets bigger..

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sounds like bacteria/parasites to me.

Well I still couldn't catch the 2 cories..and it's almost gone today. Hoping it was gas bubble disease.