I'm wondering if anyone can ID
this spot for me. It showed up about 2 weeks ago, it doesn't look raised or like anything is hanging from it. Then just a couple days ago another one popped up on his other side in almost the same location as the first.
A little info on the clown - we've had him for about three months and he acts fine otherwise, eats well and is active. We just introduced a new, smaller clown to the tank recently but I can't remember if the first one got the black spot before or after this.
He's a tank raised percula, and other tank mates include another percula and a cleaner shrimp along with snails, hermits and an emerald crab.