Whats growing on my rock?

[Dr RBG]

This orange stuff seems to be located only on this rock. I was wondering if it might be Coraline algae, a sponge or something else. What should I do with it?

 

[AlSimmons]

Can you describe what your seeing a little bit more? Have you tried removing it with a brush yet? I'm having a hard time getting a good look at it, but it might be Diatoms or even Cyanobacteria.

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

 

[Dr RBG]

more info

more info

Ir almost looks like rust. It does not scrape off, It is the color of rust, I will do some chemistry tests in a minuite

 

[AlSimmons]

Has it been there for awhile or did it just show up overnight?

 

[Dr RBG]

Couple of weeks ago I noticed it. Not sure it is spreading Chemistry: Hanna Phos 0.07 ppm, dKH 11,2, API Nitrate 20 ppm

 

[Dr RBG]

any other possibilities. Should I remove the rock and do something with it?

 

[AlSimmons]

Just keep your eye on it for the time being. If there's any major changes just let us know.

Btw your Nitrates & Phosphates are a little high.

http://www.reefkeeping.com/issues/2004-05/rhf/index.htm

 

[Dr RBG]

Thanks! Do you think I should use red sea no3 po4 x or vodka to lower the nutrients?