retracting

This is my first post on R2R. I’m new to reefing. I have a 40b with LPS and softies—almost 6 mos old. Everything looks amazing! I’ve never really had trouble with any new corals. I wanted to try goniopora, and I found a tiny but gorgeous neon pink frag at my LFS. After paying WAY too much for a...

Is this zoa being eaten by something? All the other zoas are doing well, both on the frag and in the tank. Its just this one polyp. Its been in the tank for around 2-3 months. they are loosing colour in the side where the "lashes" are retracted/gone. its been like this for 3/4 days and i think...

I added some green branching sps to my tank and watched as all the polyps retracted and the surface got jagged and bumpy (the rear coral on the picture). The tips got white and looks like it's splitting. It's also encrusting at the base and has good color, just a more neon green and I can barely...