Scratching my head

[Sunny]

OK so for past 2 weeks or so I am seeing massive amount of cyano in my frag tank. It is only in the frag tank and not a trace in DT. Flow is not an issue because the fish can barely stay still . Corals cannot stand properly either.

Why would cyano thrive in the frag tank only? Water turnover is a 1.5 inch drain and a mag 18 feeds it. It is all connected to my system.

Thoughts?

 

[CentralNano]

Hey Sunny... off topic but the frags I picked up on Monday are doing well.

I had an outbreak as well at one point and I couldn't figure it out... I cleaned it all out and put the power heads pointing towards where the outbreak was. So far... so good. Let me know if you need any help.

 

[redfishbluefish]

Where is it growing....the glass, the rack, the plugs??? If flow is good, the only other variable I could think of is light.


One other thought is the location of the MAG 18......before the skimmer, after the skimmer???

 

[Sunny]

All over egg crate and frag plugs. Mag 18 is after the skimmer.

 

[redfishbluefish]

You have the black frag rack......try putting in a piece of white and see if it grows on that. Thought is phosphates coming from the black.

 

[kschweer]

Definitely strange. I don't really know why but I have seen similar where cyano would grow in the sump and fuge but none at all in the display.

 

[Trio91]

Random thought, different lighting maybe?

 

[Sunny]

Nope. Same lights for 2 months.

 

[redfishbluefish]

I have a couple Fathom LED light fixtures you can try to see if there is improvement. . . .

 

[charterreefer]

Hi Sunny, When I first had cyano in my system several months ago it started growing on the eggcrate (white plastic), then a little spread onto a few rocks. I noticed you had a biopellet reactor while picking up those frags from you a few weeks ago (there doing great btw). Did you try adding a little nitrate to skew the redfield ratio? A little gfo might help (I don't think you were running any when I was there).
Lou

 

[JRWOHLER]

What is the Temp of the frag tank? I know they are all plumbed in but you could have a layer of warm water sitting on top of the black frag rack. Light mix?

 

[redfishbluefish]

Yet another thought......Enter - Exit location for this spurred off frag tank

Where are the plumbing locations for the pickup of water and the exit of water from this frag tank? Could it be, if too close together, it's just circulating the water, and not "refreshing" it?

 

[Dave]

Here is a thought. DT is healthy with rock covered in coralline...corals..fish..inverts. There is some natural resistance to allowing cyano take hold...and there are not many bare areas in DT that meet all the optimal conditions for cyano to take hold. Alternatively, there are large open areas in the frag tank, lights are strong, but not a lot of shading out the bottom (frag rack)....bio resistance is comparatively small....more ideal conditions for cyano to get a hold. Just a theory.


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