Help ID this thing, algae?

[letoan]

These little thing start to grow like mad in my tank.

 

[Neya]

http://www.melevsreef.com/id/annulata.html

I love this algae. Unfortunately, I think my algae eaters do too.

 

[tran]

which one. the green stuffs on the rocks or the purple one?

 

[letoan]

@Neya
Thanks, does these annulata do any harm? My army of CUC doesn't seem to touch them.

@tran
Sorry I wasn't specific, it's the green stuffs.

 

[Neya]

no harm, just another macro(?) algae. Calcerous, will grow bigger and spread with calcium addition. I cant seem to grow more than 3-4 stalks at a time. One got to 3" or so before disappearing. It's temperamental to changes in my tank, moreso than my sps corals. In some tanks it can be invasive I believe.