Red Cyano problem

[Lampshade]

Cyno is just another form of bacteria that breaks down phosphates/nitrates. The best way i've found is to increase flow to bad area's, and most importantly, have other forms of bacteria available to do that work as the cyno breaks down. Even in a ULNS you still need that breakdown to happen, so even a super clean tank can have cyno. I use ZEObaK and haven't had any issues since starting it.