Urgent Looks like something just bred in the tank

Yes you're correct: A brittle star, some stomatella, next a bristle worm and unfortunately yes an aiptasia.

 

sht lol

 

Also have this blue lime growing I. The rock work I think it's some type of sponge what do u think cotailline

 

Yeah, you're getting good, it's a harmless sponge.

 

Thanks corailline

 

You're welcome.