Frogspawn Coral Closed Up

[Bear Claw]

I have a frogspawn coral I've had a long time and its 2 main big heads have almost completely closed up. all the smaller growing heads have kinda stopped growing but are looking fine. All my water chemistry is fine except for my salinity which is at 1.020 sg. None of my other corals or fish have shown any change. Do you think it's a flow or lighting problem? I can't tell

This is the best pic I could get. The back looks about the same except the growing heads are about 3x bigger

 

[Lps_lover12]

Hard to tell but it looks like all the tissue is gone, what are your parameters? The salinity being that low would also stress it out

 

[joefishtank]

My best guess is lighting issue I think you need more. The polyp completely receded into the skeleton. It probably did it slowly because the skeleton is green not white. The babies are doing fine, I would assume a baby hammer needs less light than a big hammer. One of my hammers were also starting to look like that. I thought about it as hard as I could and I had no idea. Then I found my BTA and it turned into a melting ball of flesh.

I wouldn't trust me 100% because I'm just some guy on the internet. I would frag the top two and move it to more light and keep the babies right there and see how they do when they get bigger.