hello everyone. I was told today at my LFS that I shouldn't/ don't need to run carbon on my tank all the time.. but only when, and or if I need it. My tank is 13.5 gl, 12 working gallons, with 1.5 gl sump, and holds about 10gl after water displacement. im finishing up cycling the tank, and will do 10% to %15 WC every week. should i run carbon all the time or no?