lol yea maybe start using it again... or do a few wc
TO DROP DOWN THE PHOS/NIRTrates..... more than likely the excess phos/nit is the problem with the cyano
.... as you may know the cyano
generally grow with nit/phos so if you remove that then the cyano
should stop growing. your probably right about the low flow on the back wall causing this outbreak only there and no where else.