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Discussion Starter · #1 ·
I purchased 2 Ottos last week. A few days ago I noticed a white mark on the smaller one's head.

I don't think this is a parasite or fungus but I am not sure as I haven't kept fish in a long long time. I think it may have scratched itself on some of the lava rock as there is tons of it in my tank.

What do you guys think it is?
 

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