diatoms!

diatoms are a part of the tank maturing and should go away on their own. Some people have had the for months after starting a tank but keeping the water parameters (Nitrate, phosphates) in check help. Also I had good luck with snails and hermits taking care of diatoms (Nassarius, Cernith and Nerite are all good snails for a nano). And finally the most important thing is water changes.

I have 6 fish, dozens of corals (softies and LPS- SPS soon) and my nitrates and phosphates are zero. My 5 gallon weekly waterchanges help with that (Not to mention purigen and in your case carbon).

There is a product called red slime remover that treats cyano. I think it's a powder that you add and it dissolves the cyano and you need to do some big water changes after to clear up the water. I've never used it, I had cyano and found phosban to work good but you have a phosphate remover already right?
Another chemical is called chemi-clean and it is supposed to work on cyano.


The main answer to your question is

Water changes (RO water and a good salt)
Plenty of flow
A good cleanup crew
Fresh media in the back chambers (Purigen lasts for 6 months, I'd replace the phosphate media and the carbon every 3).
 
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thanks. also, i have patches of tiny green hairs on some of my rocks and when the lights are on they turn brown, if i point the powerhead at them the brown stuff blows off and the hairs are green again. is this cyano resting on green hair algae?
 
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