Aiptasia?

[Game2005]

Just seeing what people might think these are. I'm assuming aiptasia, and the pic isn't very good. They are all over the tank and small, like 1 or 2 mm for the most part. I was cycling the tank and had a phytoplankton bloom due to using old sand, and when the phytoplankton finally cleared up (a few months later) these were all over the 75 gallon. I don't mind if they are, just curious of anyone can definitively tell at this size.

 

[andiesreef]

colonial hydroids?

 

[JGT]

Not aiptasia. Pic is very blurry. Either hydroids or featherdusters.

 

[Just John]

What they said

 

[Game2005]

Here's a better picture

 

[Just John]

Hydroids. Whew!

 

[Goaway]

From personal experience and judging the liverock at the lfs, these are colonial hydriods and will need manual removal. They will spread.

The fluorescent green colonies don't seem to be a plague like the regular yellow/brown colonies. GL with removal.