what is that?

I guess the best bit of advice I could give you is to remove the colony and manually remove them make sure to give the colony a good shake off in a bowl of tank water to remove anything that you removed as to not put it back into your tank
 
yep dont even take the chance..In my tank,I kill anything that even looks like it could be aptasia..It's not worth it to me to even chance that plague spreading..
 
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Not hardly... lol ;)

Multiple variations of hydroids. Do image search for that term and you'll get a ton of results. I had to be extra cautious of them when I kept the dwarf seahorses as hydroids had the ability to do some serious damage to them.
 
in a closed environment...these sound nasty....

" Hydrozoa are the least familiar of the four classes because most species are small. In their complex life cycle they alternate between two types of body plan. In the asexual fase it consists of a tubular body that is connected to the substratum at the lower end and bears a ring of tentacles around the mouth at the opposite end. These types of individuals are called polyps. They asexually bud off the second stage wich resemble a miniature jellyfish and is called a medusa. They are umbrella-shaped with a pulsing bell that propels them forward, on through the water,and a central trailing malibrum that carries the mouth below the bell. Medusa are the sexual fase in the life cycle of the hydrozoa. They produce sperm and ovaries (eggs) that fuse to create planktonic larvae. Ultimately these setle and give rise to polyps. A few species have solitary polyps, but in most cases the polyps devide repeatedly to form whole colonies often featherlike in appearance. An extreme example of the division of labour in a colony occurs in the bluebottle: One individual forms the float, others serve as defensive, stinging tentacles, others are for digestion and some solely engage in reproduction."
 
Those don't sound pleasant. This is Thread is soundling like wthese buggers need to be removed. A friend is lending his digital SLR with a macro lens so I can get a better picture, won't be for another day though.

Should I go for removal tonight?
 
Your decision on whether to attempt removal or not. I've had little colonies of them here and there in my systems for years and they've never really bothered anything. The only reason they are detrimental to dwarf seahorses (max size 1") is because the body of a tiny seahorse is easily stung by them. My disclaimer is this though... my hydroids look like a different variant than what you have.

Do your zoas look irritated by them at all?
 
I also am not sold that it is aptasia. waffleman's pic points out something that looks skeletal.
I would ask you about the zoa's---- do the polyps near the mystery creatures appear irritated or not open?? Aptasia will sting the crap out of anything they touch.
 
They dont look like Aiptasia to me and Ive had about half a gazillion of them in my tank to compare them to LOL If I had to guess Id say tube worm of some type.

Tim
 
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I attempted removal (fortunately out of the tank)

here is what I pulled out:

pulledout.jpg


and the swimming team that was included:

swimmers1.jpg

swimmers2.jpg

swimmers3.jpg


any suggestions on whether or not the tank needs to be treated?
 
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