Is it a type of pest amenone?

[Twiztidninja]

Idk what the heck these are all over my tank, I just got a new gyre powerhead to get rid of my detritus on the bare bottom tank. But these white tentacles grew in the hair algae and won't leave

 

[JGT]

Looks like sponge.

 

[Twiztidninja]

Looks like sponge.

Ok thanks. They're ugly lol not harmful I hope?

 

[AydenLincoln]

Harmless sponge and/or tunicate both harmless!

 

[JGT]

Nope. Can scrape them off if you don’t want them.