black mark

Hi. I’ve just noticed this weird black ring on my foxface. It’s not raised or anything f and he’s acting normal. I’ve only had him for almost 4 months, so he’s probably a little over 3 inches. He’s housed with 2 clownfish. I have a few hammer corals and a Duncan coral that he likes to hover...

Hey everyone, just wanted to know whether anyone has experienced this before, and if its normal? I’m just concerned because my powder blue had similar marks 2-3 weeks before dying of an unknown cause. I’ve had the Moorish Idol for almost a week now, but his been eating well and has showed no...