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- Jun 27, 2019
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So I have a 135 gal tank and 40 gallon sump with a trickle tower l, i have about 20lbs of porous rock and a filter sock, its a 3 inch overflow that circulates about 1500 gallons an hour. I also have a canister filter with about another 10lbs of porous rock in there and every once in a while I will run a zeolite carbon filter bag in it flows about 600 gallons an hour and also has a uv sterilizer. Also have a deep sand bed that I bought as live sand about 2 to 3 inches deep. Then I have about 80 lbs of live rock. How often should I do water changes i have a very light bio load?