Running Carbon - How much is too much?

[smokinreefer]

Why do you think your water get discoloured?

well a few things...
i have a fair bioload and can tend to feed quite heavily at times...
my skimmer works, but is not top notch...
when DOM build up in my tank, it is seen more easily, cuz i use 400W MH 6500k iwaski bulbs which will tend to show the yellow in the water a lot better than other lights!

i also think that sometimes the discoloration is just the way my eyes percieve the color, due to the combination of algae on glass, color rendition of the tank lights, color of the ambient room lights, and color of ambient natural light. i beleive this b/c sometimes, even if the tank glass looks clean, if you still scrape it, it makes the tank look so much nicer. also as i look at the tank throughout the day, sometimes it looks a bit yellow and sometimes it looks a crisp white.

but, i have decided to up my water changes as part of my regular tank maintainence