Help with something bothering my zoas (hydroids?)

hzy422 · Jan 1, 2022

Hi everyone - I think I have something (maybe hydroids?) bothering my Zoas. Wondering if anyone could help with an ID and plan of attack? Parameters in the tank are good. This particular colony has been in the tank for about 3 months. The problem popped up this week. There is one other colony of a different type that has the same issue. There are 2 others that are just fine. All other corals are doing fine. Tank is several years old but I mostly rebooted it about 6 months ago to clear out a GSP / RBTA takeover that I got lazy with!

Thanks for any help!

This picture is a bit of a zoom out of the issue - I think the problem is the stalky type thing with the blue/translucent heads.

Here's the best I could do for a zoom in -

And just for fun, the colony about a week ago.

Just John · Jan 2, 2022

Those look like hydroids to me too. I had a problem with them and started dosing my tank with h2o2 daily for something else. When I just saw this post I realized that they have been gone for some time now. I think the h2o2 is probably why. It's worth a try. I dose 1.5 ml h2o2 per 10 gallons daily to kill off some dino's I have been dealing with. You can also pull most or all of them off with tweezers for now, but they may just come back.

hzy422 · Jan 2, 2022

Thanks, I was able to remove one group that was still on a plug. I tried a h2o2 dip and will see how that works. If it does I'll try dosing the tank.

Just John said:
Those look like hydroids to me too. I had a problem with them and started dosing my tank with h2o2 daily for something else. When I just saw this post I realized that they have been gone for some time now. I think the h2o2 is probably why. It's worth a try. I dose 1.5 ml h2o2 per 10 gallons daily to kill off some dino's I have been dealing with. You can also pull most or all of them off with tweezers for now, but they may just come back.