Blastmussa HELP!

[nudibranch]

One of my Blastmussa merleti aren't doing too well pics are enclosed.
It looks like the tissue is receeding, and i'm not sure what to do. everything else is good.
Calc 420ppm
Alk 2.98meq/l
Spec Grav 1.023
Nitrates unmeasurable

 

[nudibranch]

I added it about 2 months ago, and it has been stationary in that place for all but about 1 week of that time. Since then it has grown from 2 heads to 7!
It's under 26W of pc light (it's in a pico 0.75g) I made an error w/ my spec grav though, it was actually 1.022. I did a water change and its back to 1.024-1.025 which is my normal level. Now its looking back to normal.
I'm keeping an eye on it. Strangely, the other piece of Blast (new as of a week ago) was doing fine.
I've been wanting to get some food for my Caulastrea, would it be good to feed the Blast too? If so what would be good for both? Cyclop-eeze? Whats the best way to feed them? Including the Caulastrea? i want to minimize waste food, although the hermits will prob get it all.

 

[nudibranch]

I was adding highly concentrated phyto, just one drop, but I was getting hard yellowish deposits on my glass...almost overnight. I read on one of the baords that that was the cause and I stopped it. The prob disappeared. I wont add it again until one of my Salifert test kits is used up- then I'll does it w/ one of the syringes...prob about 1 drop from that! LOL I was thinking of spot feeding w/ tweezers, but I'm not sure how well that would work out.

 

[nudibranch]

Heh, 1 drop of what i got now feeds 15 gallons...so...yeah I hear ya w/ the concentrated. Good call on the butter knife, I'm goig to try it out right now.