Large white spot of guppy's side

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EmilyA

Aquarium Advice Newbie
Joined
Apr 11, 2013
Messages
9
Location
TX
I have spent about an hour online trying to figure out what this is affecting my guppy. He appears to have contracted this overnight as I spotted him with it this morning. The side it is on bulges a bit too. It looks like a huge pimple!

Ammonia and Nitrites are 0, Nitrates 20ppm. Did water change a few days ago. In a 46g tank with 1 male betta, 2 other guppies, 1 clown pleco, 3 corys and tons of guppy fry.
 

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I have spent about an hour online trying to figure out what this is affecting my guppy. He appears to have contracted this overnight as I spotted him with it this morning. The side it is on bulges a bit too. It looks like a huge pimple!

Ammonia and Nitrites are 0, Nitrates 20ppm. Did water change a few days ago. In a 46g tank with 1 male betta, 2 other guppies, 1 clown pleco, 3 corys and tons of guppy fry.

It could be an ulcer that's the only thing that comes to mind
 
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