I have some buttion polyps in my tank. I was looking at them recently and noticed that some of them have like white/blue dots around the edges of them. Its strange because only some of them have it while others are fine. What do you think it is? The water test are fine, I use RO
water and currently have t5 lighting. All my other corals in the tank are doing great, this could be just a false alarm I just want to be sure. I put it about half way down in the tank.
Here are some pics:
All input is appreciated!