Microfauna

[The Kapenta Kid]

I've been observing microfauna on the tank glass with a hand lens (about 10X). Many of them are easily recognisable as copepods similar to some in Haeckel's magnificent drawings.
There is one common type that I would like an ID on. It is about 1 mm across, roughly radially symmetrical. The central 'foot' which is attached to the glass is surrounded by about 12 cilia or tentacles colored in alternate light and dark bands or hoops--rather like the banding on some feather dusters.
Is it a larval form or is it a tiny anenome or duster?
In this particular tank, which is only a month or so old, there are small feather dusters and aiptasia anenomes visible on the live rock,
Here are a couple of pics, pretty dud but they may give some idea of what I am talking about.

 

[b.branscombe]

Are they these?

http://www.melevsreef.com/id/special.html

 

[b.branscombe]

double post

 

[The Kapenta Kid]

Thanks. They could well be. The only difference I see is that my specimens appear to have more regular cilia, i.e. pretty much all the same length, but that may not be significant,

 

[graveyardworm]

I believe what you have are called hydriod medusae, but I dont if they are related to jellyfish. The one pictured by b.branscombe is a jellyfish, and will leave the glass and swim around, whereas the hydroids settle onto the glass or substrate and pretty much stay in one spot.

Well alittle research does show that jellies and hydroids are related, but still different. I'm sure someone will jump in here and help to clear things up.

 

[The Kapenta Kid]

Well these guys look like they are stuck onto the glass and mean to stay there.
Perhaps of interest is that they are present on both my tanks, A 15 gal with fish and inverts and a 50 gal which has nothing in it yet other than LR and a few snails. There are very few of them in the 15 gal while the glass of the 50 gal has many present. I assume the fish are eating those in the 15 gal.