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Hi! I’ve had my koi beta for about 4 months, and have it in a planted tank. I have been fighting algae for a while, and my koi has changed color significantly during that time. Some of it I know is just coloring, but recently I’m starting to be concerned on if it is actually grow on my beta. Is this a common thing? His face used to be completely pink, but now it’s all brownish greenish.
 

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Personally in all the years I have been keeping fish and Betta in particular I have never seen algae grow on them. I have seen it growing on soe snails over the years but never fish. I think it would have to do with their slime coat.
 
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