Reef safe as in display tank? Or quarantine still. And thank you for the info. I thought maybe it was black ich.
Prazi is mostly reef safe. Sometimes, SPS will retract, but f the invertebrates are healthy going in to a treatment, losses are rare. Setting up a treatment tank on the fly and moving all the fish over for 45 days is pretty rough on the fish.
Black ich has more defined edges to the spots. These are not treated well by prazi.
