Acro parasite? Anyone know what those are?

[cb684]

Hey all.
I am trying to find out what are these structures coming out of this acro. This frag was bought about 3 to 4 weeks ago, dipped with revive on arrival and add to quarantine. It bleached out badly and a few days ago started to get more color. Two weeks ago I saw these structures on it. It is the only frag that has this in the quarantine tank, and there are other acros there. Any thoughts?
Thank you
CB

 

[plyle02]

perhaps hydroids?

 

[Icefire]

Zanclea hydroid

 

[cb684]

Thanks a lot! It really looks like it.

 

[ShesEasy]

Why would Hydroids be on acros

 

[Icefire]

Because that species can? The are symbiotic but can be considered as a pest in aquarium

 

[apex003]

Hard to see the pics on my phone for some reason, but could they be acontial filaments?

 

[flworkd]

I've seen these on hundreds of maricultured Acro colonies. My guess is that they all came from the same farm; an area with enough particulate matter in the water for them to feed off of. Once imported I watched them die off over time, every time. I've never seen [or heard] of them spreading to other colonies, however. Very interesting observation. IME the hydroids don't have enough food in the water column to continue filter feeding over time. I've never held up on feeding to rid of them, but I don't feed any powdered foods (if you do I would halt that temporarily). IME no common dips eradicated them.

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