No CC, but loosing 1.5 fc overnite

Themacdadt

Well-known member
Sep 11, 2013
176
Cocoa, fl
I am in the process of a slam since I am loosing 1.5 ppm on the OCLT but before I started I had a reading of 0 on the CC. So my question is is it possible to have algae consuming fc while no reading on cc? All other levels are in range with a cya of 90.