Chemiclean not working?

[lastlight]

to save money i'm mostly monitoring film algae on my glass to help determine gfo replacement. my levels must be adequately low as the film comes back pretty slow. i have a feeling my cyano is fueled by something else but yes i have been quite religious with my nutrient control thus far. makes having cyano all the more frustrating since i never had it once in any of my previous tanks other than the last nano during the upgrade/neglect phase.