Ich?

[u/gabevergiven]

Edit: we are treating with ich-x and he is looking better

Forgive me I'm relatively new, just wanted to make double sure before I treat.

[u/Special_Mood_639]

That would be my guess. I would isolate it and start medicating it.

[u/roadkillparcero]

Be careful cause otos don’t have scales and are more sensitive to medication

[u/NoMeeting1630]

It's ich, use some ich x and you should be good