Nonstophoops : Thank you. This is what i was trying to explain (with links to it already written). I only have a 20 gallon reef, but have a 3-4" sand bed. My nitrates are always 0, but I still do 15% weekly water changes. I plan on using this 20 as the sump/refugium to my next tank. I will probably add a few more inches of sand, once I make the change.
Thanks again.
Thanks again.