- May 31, 2006
What is a good way to get rid of nitrates in a closed, circulating system? I have been doing daily 10 gal water changes on my system which has 2 40-50 gal tanks and a sump that consists of a large black bucket of unknown capacity. It has been sufficient for a while, but of late my octos have shown a decline in appetite. How might I reduce the nitrate level in the system?