[Troy F]

Troy, the problem is there isn't a lot of long term DSBs to evaluate. So far it's a good thing, with only suspicions of bad things

Good point Brad. The reason I hesitated on setting up my DSB was just common sense; eventually a critical mass has to be reached doesn't it? I never doubted the denitrifying effect, I just worried about the long term success. I'm told that there will be information released in the near future that will be very informative and when you see the theory behind it you'll laugh at the simplicity.

Dr. Shimek himself has stated that the best place for one is apart from the main display and also, he recommends recharging your sandbed with detrivore kits yearly. These are two things few of us have the space or capital for.