Anyone have a guess?

What these are? Not aiptasia, they do not grow in the light at all. This pic was with a flashlight at night in an area that never gets light.

 

Need a better image.

Either worms of some sort or hydroids.

 

+1 Hydroids


i like you avator Corailline

 

Thank you. It's my favorite Halloween one. It's never to soon for Werewolfs right.

 

My first guess would be some variety of pseudocorynactis or strawberry anemone. They have the color and the clear tentacles. Mostly harmless and I think they play well with other coral since they are in the dark areas.

 

Not sure I am able to make it out - does it look like an anemone with little white balls at the end of the tentacles? If so it could be a ball anemone or strawberry anemone

 

Anemones are not going to come out exclusively at night, nor will Ball tips be found in the sand bed.


JM2C.

need a better image, they match the coloration and one on the left looks like it may have ball tips, but that is odd placement and behavior.

The behavior indicates to me that this a creatures that is not photosynthetic and is perhaps eating the types of inverts that are most commonly nocturnal.

 

I was afraid you'd say hydroids. For what it's worth, it's not just that they only come out at night, it's that they for exist in any place that gets light at any time of the day. They also, interestingly, do have little round balls on the end. That is not a sand bed, it's a fine detritus dust that accumulates in that spot and there isn't much of it.

I'll try for a better picture, but the circumstances make one difficult.