Is it eating? Is it breathing normally? and swimming normally?
If so, I would personally leave it alone... If it is a new addition, maybe he was bullied. Don't panic, chasing him to QT will just stress the poor thing out, more if he is already stressed.
Just my 2 cents.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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