Tissue Regression on a Frogspawn

[Lanceafer]

It has been in the same spot of more that 2 months and today before the lights came on I look in the tank as saw that the tissue is creeping back from the skeleton. I can’t figure out why. I tested everything, and it was all good. Mag was a little on the low end of normal but nothing that a water change tonight wont fix. The only thing that I can think of that is out of the ordinary is I had a power head fall off the side of the tank and blow strait at the coral for a couple of hours. Its normally mounted high and pointing across the tank. When it fell it started blowing right at the frogspawn which is on the sand bed. I also have a hammer right next to it. The hammer is doing great. As I type this, its got me thinking, could the hammer be stinging it?

 

[Agu]

Watch after lights out for stinger tentacles. IME euphyllia aren't aggressive to other euphyllia so that's probably not the problem.

I would suspect the powerhead. High direct flow, esp if it's picking up some sand on the way, can be pretty nasty to any coral.

Good Luck,