The tank is very clean. I have 2 Clowns, 1 Cleaner Shrimp and 1 Emeral Crab, plus CUC, so my bio-load is very small. I do a 5 Gallon WC probably every 10-14 days. There is a little algea in the tank, but not much and stays under control.
I took the skimmer out and rinsed everything pretty...