Is my Red Sea Star sick?

[memnoch]

I have a Red Sea Star that when initially added to the tank was very active climbing all over the LR. Now for about a week he's been staying in one spot near the surface in the stream of the powerhead, i also noticed today three of the five arms appear to sloughing some tissue. I moved him out of this spot gingerly to the bottom of the tank. After about 5 minutes he was back on the glass inching it's way up. Any thoughts?

 

[memnoch]

hmm....no reply? Just in case someone wants to comment my parameters as follows, temp 78F, ph 8.4, salinity 1.024, nitrite <0.1, ammonia <0.1, nitrate is somewhere between 10-15. I do bimonthly 25% water changes with R/o saltwater prepared by my LFS. The star was initially very active, i wish someone would comment if anything helpful could be added. This display tank is free of fish now for nearly a week since starting hypo on them in the new QT. Can starfish be affected by Ich? doesn't look like Ich. It's almost like it had a cyst on three arms which have ruptured. The peppermint shrimp are occasionally taking a nibble of it. I know it's not dead yet because it's inching up the glass. Only thing i can think of is the high pH might be stressing it. All other inverts seem fine and active as ever.