Wayne Sallee wrote:
Yep. What happens is that it is so efficient that it out competes the
bacteria on the outside of the rock and sand, so that denitrification
dos not take place as well inside of the rock and sand.

Right, but isn't there other bacteria in the live rock and sand that eat nitrates?

Don't get me wrong, I do *not* think you should buy a wet/dry when you have
enough live rock to do the job, but don't see why someone who already has a
wet/dry filter should get rid of it.

George Patterson
All successes in conservation are temporary. All defeats are permanent.