Sounds like the perfect scenario for a harlequin!I’ve had no problems with them in some tanks, pest in others…
I have 4 reef tanks: one is infested, one has a few, two tanks have none…no clue why
…if it were me, I would relentlessly remove every last one I see for the foreseeable future,…better safe than sorry
does the OP mind if I respectfully ask approx age/experience ?