Black spots

Question
My Golden Dojo Loach is getting large dark brown spots on Him at first i though it might be just a bruise or he got bumped by my Raphael cat but it seems to be getting worse should i quarantine him in hospital tank or let it be?


Answer
Hi Christopher,
As long as he is acting normal still I wouldn't bother with quarantining him. The dark brown spots most likely are natural coloration forming as many fish develop different colors/patterns as they get older.

I hope this helps!
Karen~