Toadstool coral shedding or dying?

[chibiyee]

Hi all,
Recently I’ve become concerned for my leather toadstool coral. It has been in my established tank for 2 weeks without issue. It began to look wrinkly and mucous-y a few days ago. I figured it was shedding. Then I had a new diatom outburst in my tank. I’ve managing the outburst, but now it looks my toadstool is crumbling… I’m not sure if I should just leave it be, or if it’s dying. If it’s dying I want to take it out so it doesn’t leach toxins and kill my other corals. The other corals have shrunk in and look unhappy the past few days… so I’m worried. I have a neon goby in the tank who seems fine. Let me know! I really don’t want to lose anything in the tank!

Here’s the parameters:

Ammonia 0
Nitirites 0
PH 8.1
Nitrates .25
Temp 76
SG 1.24

I attached some pics. I turned the lights up a little brighter for a better look.
Thoughts? Thanks I’m advance for any help!

 

[blaxsun]

I saw your other post but I'm honestly not sure.

 

[vetteguy53081]

The base seems to have some rot. These need moderate light and medium flow. I suspect its not getting adequate flow, but the question is : Will advancing flow perk it up. It looks very unhappy