Well I’ve had my sailfin tang for about 6 months now. And he seems happy swimming about pecking the rock eatin’ good and all that.( eats formula two and some formula one pellets as well as he eats the brine shrimp I dump in the tank) I feed pellets twice a day and a cube of shrimp every other day. The tank as a whole is doing great. So he’s the deal he’s got some marks above his eyes and traveling back coming in that definitely don’t look right. So I did some reading on here looking for answers. Didn’t see much as exact answers other then It could be malnutrition. I was going to pick up some selcon and see how that went. But I was wondering if anyone had different input or has ran across this before!