Hydroids growing on zoa?

[NYC_Reef]

I tried searching online and the other pictures of hydroids look a bit different than what is growin on some of my corals, but hydroids are the closest possibility I could find. Can anyone confirm if these are hydroids or something else? I pulled the zoa out for a dip and pulled them off with tweezers but they grew back. The same growth seems to have spread to another zoa that has them growing on its sides, a monti began growing some from the center of the coral and they are starting to also grow on the sides of some of my frag plugs I have in a rack (interestingly they haven't spread from the plug to the coral on my SPS frags).

Any advice is much appreciated

 

[stevo01]

Looks like hydoids.

 

[SEMA]

I cant really tell from the photos.. hydroids are like very small anemones or polyps. Most common is the white variety, and usually can find them on the walls in your sump, corner of tank on seems, and are usually harmless. (Probably 80% of tanks have them and dont know it) Another variety grows colonial, brown, slightly larger in size, with a hard tube. These will eventually crawl onto anything and explode in growth with plenty of dissolved organics. On zoanthids with pests of thing you dont want growing (algae) use a hydrogen peroxide dip dilluted and a small brush.

 

[NYC_Reef]

I haven't noticed them spread onto any of the walls, rock, etc.; they have only showed up on a few corals (mostly zoa) and the frag plugs. I'm in process of switching tanks, so I want to make sure I take care of whatever dips, etc necessary to try and prevent or minimize their growth in the new tank. I tried to get some better pics of them below, apologies for the bad resolution

One monti had a growth sprouting up from the middle of it. Nothing happened for a couple of weeks, then it RTN'd in ~24 hours



Zoa in higher res, not sure what the dark tube shaped thing is


Zoomed in


Hard to photograph, but growth on the side of a plug on one of the acros



Same acro from above at a different angle

 

[saltyfilmfolks]

Tooth brush them out of the tank and cut down on amino coral frenzy type foods. It'll cut back on the population. My pigmy angel takes care of little stuff like that.

 

[NYC_Reef]

Thanks for the tip. I have been using the Fuel brand of amino acid supplement along with reef roids with target feeding reef roids almost every other day. I will try to dial that back after giving these a scrub and a peroxide dip to see if that helps

 

[SEMA]

Yea still looks like hydroids. Less feeding will help, peroxide dip is probably your best bet. Look up some recipes for how much peroxide per saltwater and dip away. Make sure the zoas close up, and they will tolerate the dip just fine. Good luck, hope you get them! Also make sure none have grown onto the rack or anything close by. It only takes one!

 

[Brad Vaughn]

I have them too. Thx for the tips.

 

[Brad Vaughn]

I have them too. Thx for the tips.

 

[Brad Vaughn]

I haven't noticed them spread onto any of the walls, rock, etc.; they have only showed up on a few corals (mostly zoa) and the frag plugs. I'm in process of switching tanks, so I want to make sure I take care of whatever dips, etc necessary to try and prevent or minimize their growth in the new tank. I tried to get some better pics of them below, apologies for the bad resolution

One monti had a growth sprouting up from the middle of it. Nothing happened for a couple of weeks, then it RTN'd in ~24 hours



Zoa in higher res, not sure what the dark tube shaped thing is


Zoomed in


Hard to photograph, but growth on the side of a plug on one of the acros



Same acro from above at a different angle

Any luck? Did you do peroxide?

 

[NYC_Reef]

Any luck? Did you do peroxide?

I had some luck with the peroxide dip, some required a 2nd dip. Zoas did fine in the dip, but montis reacted poorly and an acro died. I thought the montis were dead but after a couple of months coloration is starting to return. I did this in conjunction with a tank switch, so I made sure to put frags on new plugs after the dip. I wanted to minimize the risk of cross contamination so there were only a couple of smaller pieces of live rock I was comfortable moving to the new tank after a good scrub. Hitting any localized spots of hydroids on live rock with a brûlée torch also seemed to work. I haven't seen any hydroids in my new tank so fingers crossed.

 

[Brad Vaughn]

I had some luck with the peroxide dip, some required a 2nd dip. Zoas did fine in the dip, but montis reacted poorly and an acro died. I thought the montis were dead but after a couple of months coloration is starting to return. I did this in conjunction with a tank switch, so I made sure to put frags on new plugs after the dip. I wanted to minimize the risk of cross contamination so there were only a couple of smaller pieces of live rock I was comfortable moving to the new tank after a good scrub. Hitting any localized spots of hydroids on live rock with a brûlée torch also seemed to work. I haven't seen any hydroids in my new tank so fingers crossed.

Did you do 1:10 ratio peroxide to tank water? Thank you for updating!

 

[NYC_Reef]

Did you do 1:10 ratio peroxide to tank water? Thank you for updating!

Unfortunately I don't recall exactly, but it I want to say it was higher than that. When searching I remember seeing a range of recommendations and I erred on the more aggressive. Keep in mind the ones I was dipping were mostly pieces I wouldn't have been devastated about losing. A few acros I didn't want to dip were too encrusted for me to switch plugs, so I was just vigilant about scrubbing the plugs a few times and they ended up encrusting over the problem areas, the hydroids never spread to the actual acro