Open brain coral problems

[rileyon]

You might find some helpful ideas on the "Rescue Coral" thread on this forum. People have reversed tissue recession before. I once had an ailing Scoly that I was able to nurse back to health by elevating it off the sand bed by an inch. I also spot treated the exposed skeleton with peroxide - making sure to keep it off the tissue - and used some Seachem iodine dip. Then I made sure to feed it well. The result was a 100% recovery, with new tissue growing over the patch of bare skeleton.

I've got a theory that sometimes sand can be a problem if LPS tissue is touching or very close to it. Maybe it's providing a vector for unknown problems. Low flow in that area of the tank could also be an issue. Flow around coral tissue is important, as it removes old cellular material and allows new material to replace it. I'd suggest trying to hike it up a bit off the sand with a flat piece of LR or similar.

[flame9]

I'd try giving him a bit more light, but instead of moving him up, leave him on the bottom of the tank and make sure he's getting direct light.