Cyano...

[5ft24]

I know this has been discussed to death, but short of chemicals, I am running out of ideas. My 55g FOWLR is a year and a half old. A month or so ago, I developed a little cyano. Daylights off for 3 days got rid of it, and I replaced my GFO. Had a sudden overrun of green hair algae, cyano and short brown hair algae I cannot get rid of. No changes to the tank at all. Doing 10 gal water changes weekly, replaced the lights etc. Salinity 1.025, temp 77 +- .1, nitrates <10, alk 10, calcium 400, phosphates undetectable. Fresh Rowaphos GFO. I have a ton of pineapple sponges all over. Feeding Thera+ and nori. Water is RO/DI, replaced resin, TDS 0.
Have to clean glass daily due to green hard algae film. I'm about ready to just tear it down and start over... As far as bio load, 1 yellow tang, 1 spotted puffer, 2 "caramel", 1 clarkii and one ocellaris clown and 2 blue and gold damsels. Running HOB skimmer that has been doing a good job.
As I say, it started suddenly with nothing else changing and am at a loss.
Thanks

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[Titanwerx]

Test your RO water, and saltwater. If you make your own make sure all your filters are replaced regularly. Reduce feeding or change what u feed entirely. Also make sure your bulbs are not more than 6months old.

 

[TH64]

What are you testing phosphates with? I would say it's not giving you accurate #'s if you have cyano and algae growing within a day. There's usually some detectable level from what I understand...

 

[5ft24]

I'm using a Hannah for PO4, fresh api for all others. Water out of the RO/DI is 0 TDs, source is well water here. Have 3 lakes surrounding us within 1/4 mile in all directions. Changed bulbs when it started. Just ran tests again, all the same except Nitrates are below 5ppm. Haven't changed salt etc, still using Oceanic.

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[5ft24]

Not a freshwater api, a fresh api reef kit.

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[Reef Lounge USA]

Sometimes the tests can be misleading. The algae in your tank might be using up just enough nitrate and phosphate to keep your numbers low when in reality there is plenty of both to keep the algae, and in this case the cyano, fed. Do you run activated carbon? It can be very efficient at absorbing organic material and can help with cyano. Other than that I would recommend stepping up your maintenance schedule. Try using smaller amounts of gfo and changing more frequently. Good luck.

 

[e92Monster]

crank up the flow so it doesnt have anywhere to settle?

 

[lurking]

crank up the flow so it doesnt have anywhere to settle?

This! Most of the time when cyano persists it's always due to a lack of flow and allowing dead spots in a tank. Try placing another power head in the tank


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[peter]

What kinda of lighting do you have? Old t5 bulbs can make it grow.

 

[5ft24]

Bulbs are new. Have 2 65w PC dual actinics and 2 65w 10k PC. I've got 2 800gph power heads, and they are giving the most circulation without blowing my sand around. One of the heaviest areas of cyano is right where one of the power heads is blasting. I've siphoned it off multiple times as well.

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