Hydroids and Peroxide

[Ian Baxter]

I have a ton of hydroids in my tank that have spread like wildfire. I have one giant rock with no corals that I am going to scrub (outside of the tank) and peroxide dip. I believe it's 1:1 w/ saltwater for 5-10 minutes. I also am going to get a sea hare and possibly 2 fringeback nudis. My tank is a 190g. I also have some good sized rocks with mushrooms and a toadstool leather on them. Can I peroxide dip those too? I'm 99% sure they are colonial hydroids. One photo is with the lights off and a flashlight.

 

[BryanM]

Pics under white lights would allow others to confirm.

As for the dip, the coral free rock is fine, but the rocks with corals on them, that strong of a dip will burn the corals.

I also don't think Seahares touch hydroids, and I can't imagine 2 nudis being able to do very much damage in a 190g tank.... And if you have a wrasse, they will likely be a tasty meal for the wrasse.

 

[Ian Baxter]

Pics under white lights would allow others to confirm.

As for the dip, the coral free rock is fine, but the rocks with corals on them, that strong of a dip will burn the corals.

I also don't think Seahares touch hydroids, and I can't imagine 2 nudis being able to do very much damage in a 190g tank.... And if you have a wrasse, they will likely be a tasty meal for the wrasse.

I’ll post a pic in the pain post. I finished the big rock. I have a melanurus wrasse I can get next Thursday. I was reading that some seahares eat hydroids which is why I was considering them.

 

[EnterName]

Yes, looks like hydroids to me...

I'm not entirely sure, but if they come out of tubes they might be coronate polyps (class Scyphozoa instead of Hydrozoa). Either way, they are treated pretty much the same by the reef tank community and besides a biological curiosity there is no need to distinguish them as far as I'm aware.

 

[Ian Baxter]

Yes, looks like hydroids to me...

I'm not entirely sure, but if they come out of tubes they might be coronate polyps (class Scyphozoa instead of Hydrozoa). Either way, they are treated pretty much the same by the reef tank community and besides a biological curiosity there is no need to distinguish them as far as I'm aware.

Thanks. I think they come out of the tube but the tubes or stalks are so small it’s hard to tell.

 

[BryanM]

Yeppers, looks like dreaded hydroids to me as well.

If the other locations aren't terribly large they can be covered with kalk paste with the flow off. If they are larger patches this isn't a very good option, or you'll just need to treat smaller areas, as it can increase ph and alk.

 

[BryanM]

Yeppers, looks like dreaded hydroids to me as well.

If the other locations aren't terribly large they can be covered with kalk paste with the flow off. If they are larger patches this isn't a very good option, or you'll just need to treat smaller areas, as it can increase ph and alk.

 

[Mr. Mojo Rising]

Are you even sure that peroxide will kill the hydroids? I know that scrubbing the rock won't kill them, they root deep in the rock. I've tried many ways to kill them, they always come back.