I do 10-15% water changes weekly, religiously (right before I water my plants
I do not over feed either so my coral and water stay very clean.
The water itself looks good at the moment, but I threw some carbon in my canisters when I first set it up to get a good start on the initial water quality. I'm not going to change it out though. It makes a great place for bacteria to grow.
the Diatom filter won't take out all the discoloration due to tannins from your driftwood.
How much discoloration will it remove if not all? Other than carbon, what would take out the discoloration?