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Dwarf pea puffer with symmetrical nubs beneath mouth; lymphocystis?
(lemmy.blahaj.zone)
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Also, checking the amount of debris on your picture, it seems you are not doing cleaning enough, which is a source for itch bacteria. My usage in this case is one 30% water change per week until it stabilizes, then once every 2 week, depending on your filter. Be careful with the water changes if you decide to treat.