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Agreed with hydroids:
I've heard smothering the hydroids with kalk paste may work, but here are some other threads with suggestions that might be helpful:
Hydroids: a reference to some strategies
Like many of us, I have had problems on and off over the years with Hydroids. The ones that have always given me the most problems are the common ones that almost look like a smaller and darker version of the beginner coral called Yellow Polyps. But the colonial Hydroid is much smaller than...www.reef2reef.comHydroids - How do I eliminate- They have taken over my tank
So I have this stuff that has pretty much taken over my tank and I can't get rid of it. I'm looking for an ID and an eradication plan that is anything short of a total teardown.www.reef2reef.com
These may help:
Edit: A relevant link in post 7 of the link above:Fenbendazole dip for blue clove polyp/hydroids.
FYI So I had more than few blue clove and what i believe are hydroids pop up on a few frags and start spreading in the frag system. I didn't want to start out treating the whole system so I picked the most populated frags to treat. I mixed 1/4 gram of Fenbendazole with 1 cup of saltwater as a...www.reef2reef.com
Here it is! Fenbendazole use against hydroids
Hi all! Well after getting a lot of questions about the use of fenbendazol I figured I would write this up. This is for informational purposes and I will not be held liable for improper use. Fenbendazol must be used exactly as I instruct or run the risk of a tank crash. Now lets get to it! So...www.reef2reef.com
Will do a peroxyde dip, brush them, then apply lemon juice to none zoanthid part and see..Basic Peroxyde dip could help.
Its wierd, my zoanthid were fine for weeks then this happened.I had a similar things.
peroxide help.
it came back a little after a few days, then disappeared without intervention.