I found out about this on July 4th. I am not sure is it definitely small black worms. There are different opinions about this matter. But I'm sure that the worms only appears on the bleached part(white part). I've been given cat drug twice.What baffles me is that there seem to be fewer worms,but it is not disappear. I cut the mother coral into broken branches. But I still found that the broken branches were STN on September 10th with a few small black worms.
What's more, my tank n0.2 p0.02, but the red slime algae last for 3 weeks. How could I fix it.