Bare Bottom Tanks

[Aquattro]

Originally Posted by danny zubot

10% of those "bugs" account for about 85 to 90% of the denitrification process, all of which occures withing the first 3/4 inches of sand in an aquarium.

So with my BB tank, how does one explain 0 ppm NO3? Sand CAN be home to bacteria, but inthe absence of sand, more than enough "bugs" exist on and in the rock to perform denitrification.