OK,, then if a DSB that is properly set up and maintained by replacing substrate at some level in some frequency can work why would I not make it ONE of the filtration methods of my system? I know GFO and Carbon can do the primary objective of nitrate and Po4 reduction. In a larger tank system I use a TON of Carbon and GFO. IF I can naturally reduce the amount of GFO and Carbon I use since I have the space for a RDSB,, why would I not want to?
I still have not found anything specific to say why NOT to run a RDSB. Of course there are those that say it is a ticking time bomb just waiting to erupt and crash the tank. That only happens with abuse, neglect and improper set up and maintenance. Which by the way will crash any system.
When I do any research on this reading the science of a DSB it makes sense. Again, the only thing against a DSB when properly setup and maintained can crash after many years. But most agree that the hype over the crashing of DSB's are not unlike nearly any filtration method that is neglected.
I think I read on the advanced section debating DSB's that someone counted the Tank of the Months for the last four years or so and found that most WERE DSB of some sort. Not that it makes it the right thing,,, BUT it does say it can be done right and many do it right.