I would consider the Reefpack, it kind of maxes out at that size and you may have to change the cartridge alot but it works really well. Otherwise a 3167, a Biohydroreactor and a 3130/2 should do a superb job. Use the 7400/2 to run the filter and then one Stream added to that should provide great flow. The only small parts you will need is a few 3000.244 sets for mounting the filters, some of these kits I have don't include these yet and then you need part 3176.71 which is like a backward venturi that feeds water from the filter to the denitrator. In this manner the cartridge debris is the carbon source for the denitrator.