What are these little things in my aquarium glass?

[erulib]

Today I noticed these fuzzy things in my aquarium glass they’re eveywhere and they have little legs that move with the water flow

 

[Cichlid Dad]

I forgot the name, normal in a new tank. They will go away and are harmless

Today I noticed these fuzzy things in my aquarium glass they’re eveywhere and they have little legs that move with the water flow

 

[MikeTheNewbie]

Hydroids?
I had some long time ago and fellow reefers suggested they were hydroids. They disappeared after a couple of weeks

 

[elysics]

Hydroid jellyfish. Usually they just happen in new tanks and then die off, it's a bit rare that their mother colonies survive

 

[Reefkeepers Archive]

Hydroids, the name often scares some people though this species is harmless and common in new tanks. Will go away after a few weeks or so