Nocturnal Aptasia?

[MikeDeL]

When I was moving rock into my 45 I found this thing living under on a rock underneath another piece of rock, where there was no light hitting it. I thought it was aptasia and was going to zap it but forgot. I left the piece of rock it was on in my nano. Couple of days later when I went to move the rock it was on I noticed it wasnt there anymore. It had moved underneath the rock, into the sand bed. Now all that is in that tank is sand and this thing. It only opens up at night and retracts shortly after the lights come on. It doesnt look like your normal brown aptasia, its kinda cool looking. It is a translusent pink with a big white mouth and blue and purple bubbles at the end of the tenticles.

[R_S_C]

i've got two similar creatures in my tank that only extend at night. someone once refered to them as hydras or something like that?

[::pete::]

Its tough to tell from the picture, but looks like a majano anemone.