Cyano :(
 

Alas my new tank (2 years approx now I think) is suffering the same problems my old one did and it seems no matter what I do I am always fighting with cyano.

My lights are LED (AI Vega).
Flow is via 2 MP40s running at max plus 2 return pumps.
Nitrate: 0ppm
Phosphate: 0ppm
I feed only once per day currently New Era flakes. I only feed what is consumed and have a lot of critters that take care of any drop that hits the bottom.

Skimmer is Super Reef Octopus Cone with capacity rated almost double the tank size.

Photo period is noon to 10pm then moonlights on moon-cycle.
Tested the RODI, TDS its coming out 0ppm although for 2 weeks or so there it could have been maybe 2ppm before I replaced the DI resin.

I even syphon the stuff out when I do water changes.

What else can I do? I am tempted to do a 3 days lights out and water change at the end but also worried about loosing a bunch of SPS in the process.

I added some Purigen about 2 weeks ago and I think its helping but hard to tell.

http://applications.ccusa.com/martin/img_0318.jpg
http://applications.ccusa.com/martin/img_0319.jpg

Its done a lot of damage to my German Blue Digi
http://applications.ccusa.com/martin/img_0320.jpg

On another note I started running Carbon 24/7 (BRS Rox) about a year ago and I have had more coral disease this year than ever before. :/

why not just hit it with chemiclean?

Its getting to the point where I might have to. I have been considering that a last resort after watching some videos on youtube and doing some reading.

It's always my first resort. It's rare that I get cyano, maybe 3 times, but always hit it with CC and I'm done with it in a couple days. Like you, all the usual suspects are always in order, so really nothing I can change. And if you leave it long enough, it starts smothering corals. So, first sign, I dose.

Hmm I may have to pick some up then.

2 More pics.

http://applications.ccusa.com/Martin/IMG_0323.jpg

My RBTA is gonna take over and climb out of the tank soon haha:

http://applications.ccusa.com/Martin/IMG_0321.jpg

Just be aware it will put your skimmer in over drive :) I turn my cup sideways during treatment to avoid the mess!

Do you turn skimmer and carbon off for 24 hours?

+1 in the Chemiclean as well! Also my first resort LOL.

skimmer stays on, but tilt the cup so it overflows without making a mess. No carbon until you want it gone. I usually leave it 2 or 3 days, then a large water change and carbon. Skimmer takes some tweaking until it's fully removed.

I take out my carbon but just lower the bubble level in the skimmer chamber and/or raise my skimmer up in the water column if required until it stops overflowing. The product decreases oxygen levels so continuing to run the skimmer is recommended.