what are these?

I've been seeing these on my rock for a while now. there are a lot of them. at first i thought they were small aiptasia but they don't grow any bigger. they are white, with a thin stalk then very thin almost clear tentacles on the ends. any idea what they are?

 

Looks like some kind of hydroid. Better kill them if you can.

Jack

 

yep i agree with above

 

Hydroids, larval jellyfish, rarely survive if at all

 

How would i do this? they are all over my rocks. i have a lot of them. Does anything eat them?

I hope so, if they bad. they have been there for a while and are spreading though. I have hundreds in my tank killing them one by one is not really an option.

 

I had them do that for a while then they went away, hopefully yours will do the same. I know of no easy way to kill them.

 

well that's good. you remember about how long they stayed?

 

A month or two at the most, but my tank was FOWLR at the time and the water quality wasn't that great.

 

I have a FOWLR now but i'm converting to reef. i recently added a fuge, so hopefully that should help.

 

Wish you the best on success