Algae or Cyano?

[Scott07]

Can anyone identify this as either algae or green cyanobacteria? Tank is just over 1 year old, and I have been combating this for 3 or 4 months now. Nitrates test as low as my API kit will go, and phosphates have always tested zero with my hanna low range checker. I'm running some gfo in a media bag between baffles in my sump and changing it every other day. Its helping some, but not a lot. The possibility that this could be cyano just crossed my mind today. Trying to decide whether to set up my media reactor or to try cemiclean.

 

[mcgyvr]

Looks like a green cyano to me..

I have never believed its there because of elevated phosphate so IMO you are just wasting your time/money with the GFO..

 

[Scott07]

Looks like a green cyano to me..

I have never believed its there because of elevated phosphate so IMO you are just wasting your time/money with the GFO..

Yea i didn't even think of cyano until today because of how green it is. Haha at least the gfo has been keeping my glass nice and clean lol

 

[ReefMaster48]

Chemiclean works great to kill red cyano. But I'm not sure if it will kill the green stuff. Not sure if there's a difference other then color.

 

[mcgyvr]

Chemiclean can be used with blue-green cyano also..

 

[Scott07]

Chemiclean can be used with blue-green cyano also..

Well..... just dosed it so, fingers crossed!!

 

[ReefMaster48]

Well..... just dosed it so, fingers crossed!!

haha there ya go then! I would be surprised if it doesn't work. Awesome stuff!

 

[Scott07]

FWIW.... yes I believe this was cyano. The red slime remover I used is working. It's been 22 or so hours now and cyano is maybe 70% gone. I'm worried ill have to re-dose after 48 hours, but I'd rather get it all than just have it come right back. All corals except for acans and my green kenya tree are upset... polyps retracted. 1 sps appears to have lost some color. I've modified my lights so only blues come on today. All fish and inverts so far are fine.