Advice needed

[wreck]

My tank is havin a cyano out break, Lot of algae on the glass.

Tank is a 65 gallon with 40 b sump, skimmer is the vertex in100, running 1 hydro koralia 750 , 1 tunze 6025 ,1 tunze 6045. There zshould be ample flow, return pump is a mag7.

I bought a reactor and media and a seachem phosphate test kit, I assumed the phosphates were high, I tested them tonight and they were reading .00-.03.

I have an old API test kit for nitrates but its screwed. I will pick one up tmr.

My question is what could be the culprit of the cyano? Would running carbon help with cyano and algae on the glass?

Any suggestions?