I've been dealing with some algae and going through the SLAM process. This morning I woke to find my FC dropped by c1 over night, so that's good. But my CC is 1 5. Those two things don't make sense to me. If my CC is 1.5, something is in there using the chlorine right? Also, there's a small amount of gray stuff in the bottom, guessing some dead algae, or maybe a mix of that and some DE from the filter. Any tips?