The 65 gal tank I have, has a sump built into the back of the tank, with a spillway at the top that the water goes into from the tank. I have live rock, and live sand in the tank, and 2 fish ( 1 clown and 1 damsel), and 5 hermit crabs. There is not much water movement towards the bottom of the tank. I'm concerned about waste build up in the bottom of the tank. Should I be concerned? I'm doing 10 gallon water changes every 2 weeks, and syphoning the junk of the bottom. Is this enough, or should I do more?
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