Weird Stuff In My Aquarium

[lastlight]

I have the same stuff. Looks like dead hair algae a bit but it actually has a few branches from each point of origin. I was wondering if it was a sort of hydroid...

I toothbrush them away but they do grow back. Flourish in lower light / under my overhangs. They also trap detritus really well and look shaggier over time.

If my stuff is not like yours excuse the random post lol.