Here's what I'm doing. I'm in the process of cycling (all dry rock) my 93g cube, and I forced a strong cycle (ammonia 9.0). I suspect when all of the ammonia and nitrites are at zero my nitrates will be through the roof! To combat this, I decided I would buy some Matrix and use it to my advantage (in theory). So I took the Matrix and placed in the sump, in a VERY well established 300g system for several weeks. The benificial bacteria should leach onto the matrix (a much higher baterial count then my little 93g cube will need) and I plan to use that bacteria to export most of the nitrates at the end of my cycle to decrease the amount of water changes I would otherwise have to do. At the end of it all, the "EXTRA" bacteria will die off as I won't I won't have enough bioload to sustain it.
Results to follow...