Please ID, found it on my anenome's rock

[serum153]

I was looking at my tank today and found this hiding in the same rock that my gbta is attached to. My nem has been doing bad as of late and I still can't figure out why. He only swells big at night and in the day it is usually shriveled. Lighting is 4x54w t5ho. Everything else is thriving and my params are:
Salinity 1.026
Temp 80
Ph 8.2
Ammonia - 0
Nitrites - 0
Nitrates - 10
Ph - 0 (but who knows since I have some cyano)
Calcium 420
Alk - 3.5 meq/l
Mag - 1300
http://i169.photobucket.com/albums/u235/serum153/DSC01527.jpg
http://i169.photobucket.com/albums/u235/serum153/DSC01531.jpg

[reefergeorge]

stomatella snail. Reef safe

[Aquarist007]

they feed in the early evenings, early mornings and at night so their tentacles are extended.

[Aquarist007]

......are you feeding your anemone?

[Sk8r]

Confirm: definitely a stomatella, an enviable find. Treat it nicely.
The nem could be temporarily annoyed by it, but it would be a passing situation. Look to current or placement for the problem with an unhappy nem. If that doesn't fix it, consider lighting or food.

[serum153]

Thanks for the quick responses. capn - I feed it a silverside 2x a week, but it hasn't wanted to feed for the last week.