Pls help me diagnose my sick pleco!

Jennanicole

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Dec 4, 2020
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I have a 25 gal, NOT a planted tank, not in natural daylight, with 9 tetras, 3 different snails, and a 6 month common pleco (the sick fish). I use the API master test kit: Ammonia 0/Nitrates 5/Nitrites 0/PH 7.8. Temp 78.

this morning I noticed he has developed a bump with a pinkish/whitish discoloration, almost like a human zit? Could not have been there more than a day or two. I have been thinking lympho or a bacterial infection but I’m new to plecos and not sure what to do. I’m thinking it could possibly be an injury as well. Any help or advice would be greatly appreciated as I cannot find anyone to take him off my hands either4B97E1CF-21D1-422C-B5F8-09E90C504AD8.jpeg