Are these Hydroids?

[Darkcartographer]

I woke up and found these on my aquarium glass. They look like tiny starfish. From reading online, they seem to be hydroids, is that correct?

 

[ying yang]

Seems so yeah

What is that!! A R2R guide to common new tank hitchhikers.

One of the greatest things about starting a reef tank is getting your live rock in and admiring all the diversity within it. The rock comes to life different creatures. This is a guide that I, along with a very well known critter identifier @KJ , have put together for the new reefer on what...

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[Mogwai]

I woke up and found these on my aquarium glass. They look like tiny starfish. From reading online, they seem to be hydroids, is that correct?

Those are definitely hydroids. I found 1 or 2 of those things on my glass also. Now at night I flash my camera light and see these web like strings coming from different places on my rocks. I thought they were tube worms at first but now I realized what they are and I'm upset.

 

[Tathamet]

Yep, I believe the Medusa (jellyfish) stage is after that one. That or they are that stage and just grabbing the glass. I can’t remember exactly.

I used to have big waves of them like that and then eventually they all disappeared. Those things seemed to sting everything. If you watch a snail going along the glass you’ll see it recoiling constantly as they try to navigate past them.

still have colonial hydroids after a couple years that seem impossible to kill though lol.

 

[BanjoBandito]

Yep, I believe the Medusa (jellyfish) stage is after that one. That or they are that stage and just grabbing the glass. I can’t remember exactly.

I used to have big waves of them like that and then eventually they all disappeared. Those things seemed to sting everything. If you watch a snail going along the glass you’ll see it recoiling constantly as they try to navigate past them.

still have colonial hydroids after a couple years that seem impossible to kill though lol.

colonial hydroids are no joke. They are absolutely indestructible.

 

[vetteguy53081]

They sure are and likely medusa version and can be scraped off galss into a net using old credit card Or simply starve them and they will die off
Flame back pygmy anges eat them like candy. These often emerge from new live rock

 

[Tathamet]

colonial hydroids are no joke. They are absolutely indestructible.

yeah I kinda gave up after the blow torch didn’t work lol. Luckily they don’t spread too fast. Now I just glue over them every now and then to keep them somewhat managed.

 

[BanjoBandito]

yeah I kinda gave up after the blow torch didn’t work lol. Luckily they don’t spread too fast. Now I just glue over them every now and then to keep them somewhat managed.

lol, that's what I did, I just epoxy globbed over them whenever I saw them. Seemed to work.

 

[Mogwai]

Yep, I believe the Medusa (jellyfish) stage is after that one. That or they are that stage and just grabbing the glass. I can’t remember exactly.

I used to have big waves of them like that and then eventually they all disappeared. Those things seemed to sting everything. If you watch a snail going along the glass you’ll see it recoiling constantly as they try to navigate past them.

still have colonial hydroids after a couple years that seem impossible to kill though lol.

I'm just upset because I will have to take rock out 1 by 1 and manually remove them. It's weird because I only saw them at night and during the day nothing. My zoanthids were open and the string was in between the zoa polyps and no negative reaction from the zoas.

 

[Tathamet]

I'm just upset because I will have to take rock out 1 by 1 and manually remove them. It's weird because I only saw them at night and during the day nothing. My zoanthids were open and the string was in between the zoa polyps and no negative reaction from the zoas.

yeah they don’t seem to be a big deal. they just kinda bothered a lot of things in my tank. Ate lots of pods too lol but those ones eventually went away on their own.

 

[Mogwai]

yeah they don’t seem to be a big deal. they just kinda bothered a lot of things in my tank. Ate lots of pods too lol but those ones eventually went away on their own.

I have tons of copepods and I just replenished my tank with pods yesterday. I guess this is what they mean when people say, "This hobby comes with many ups and downs so prepare yourself!"