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SCAPEr
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2,560 Posts
Discussion Starter · #1 ·
so I have my tetra for quite a while. first time happening to me, my tetra's mouth are deforming over time. each day their mouth is turning white-ish and starting to swollen/ deforming. some cant even move their mouth because its open/hardened.

is it because too much co2 in my tank?

help pls.
 

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It's not co2. Too much co2 makes fish gasp at the surface and reddens their gills. Infection of some kind. Post a pic.
 
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