What is this?

[dConkle]

I'm new to the hobby and I've had my 10g nano reef up and running for about 4 months now and this purple stuff has started growing on some of my rock. It's seems to have bubbles trapped underneath it. Does anybody know what this is? Thanks

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[Percula9]

It looks like Cyanobacteria.Syphon it out.

 

[talamasca]

It looks like Cyanobacteria to me as well. Seeing this is actually quite common for a tank that's only 4 months old. The links below might help.

http://www.reefcleaners.org/nuisance-algae-id-guide

http://www.reefcentral.com/forums/showthread.php?t=2095174&highlight=cynobacteria

http://www.reefcentral.com/forums/showthread.php?t=2279039

 

[SeaCucumberFan]

Cyano for sure

 

[Percula9]

It looks like we all concur.This is caused by phosphate levels that are to high.Syphon it out and do a water change.Reduce feeding to every other day.Run only blue light for a few days.

 

[Jon0807]

Pluck it out as much as you can. I've been battling it for a while now and it's just now slowly disappearing. It'll take over your rocks, sand bed and corals if you don't tame it down

 

[Jon0807]

It looks like we all concur.This is caused by phosphate levels that are to high.Syphon it out and do a water change.Reduce feeding to every other day.Run only blue light for a few days.

Nitrates also. I've had 0 phosphates yet my nitrates were sky high and cyano exploded in my tank