Help with Blasto frag

[phenom5]

Hey,

I've had this Blasto frag in my tank for 2-3 months. It's been doing fine for up until about a week/ week and half ago. The skeleton is exposed on the upper right head, it almost looks like it's pulling away from the skeleton.

Tank Info:
20g Long w/ 2.5 DIY fuge w/ cheato
70W MH w/ 14,000K bulb
Flow is roughly 20x turnover
SG- 1.026
Temp- 79-81
NH4 & NO2- 0
NO3 > 5ppm
Ca- 400-420ppm
Alk- 9.8-10.1

Water is RO/DI- TDS of 5 (hopefully Santa's bringing me some new membranes)
Weekly 4g water changes
Feed Mysis shrimp weekly (I feed the colony, and try to make sure that each head gets some, Mysis is freeze-dried, which I'm not sure is the best food, let me know if you have a suggestion on something better.)

Not sure what else you might need info-wise, let me know.

Thanks for any help.

Here's a picture (not the best)...

[jasper24]

Is it just the 1 polyp retracting? I have had this happen and lose 1 entire polyp and have 3 smaller ones grow in its place.

[phenom5]

Is it just the 1 polyp retracting? I have had this happen and lose 1 entire polyp and have 3 smaller ones grow in its place.

So far it's just the one polyp. That's what I was hoping, just losing the one would be okay (obviously losing none would be ideal), as long as the whole thing doesn't take a nose dive.

[Appaloosa1224]

I had this happen to mine a little while ago. Does it seem worse in the morning when the lights come on? Mine got stressed from my reaquascaping and then at night copepods were attacking it. I didn't think I would save it. I'm sure this wasn't ideal, but I left the lights on for a few days and it recovered enough to keep the copepods away, now its doing great.

[otiso777]

Do you feed your Blasto? Feeding LPS can help prevent and stop tissue recession.