I just found a lot of transparent Aiptasia in my tank. It's not like typical Aiptasia; it's transparent. Is it algae or Aiptasia? What should I do? Thank you
Any chance of clearer pics under brighter white light?
It looks more like a feather duster worm crown or barnacle cirri (feather dusters and barnacles are both harmless filter feeders that are safe to keep) than Aiptasia to me, and it's definitely not algae, but clearer pics could help with saying for sure.
From the pictures you have I would go with feather dusters also. I have a bunch of different types that came off of live rock, etc. Great filter feeders.