Help building Nano sulphur reactor

[harleyguy]

It's often very hard (at least for me) to keep my Nitrates down in my RSM, so I thought I'd like to build a Nano sized sulphur De-nitrification reactor... Has anyone ever built one of these (even on a normal size scale)? Or does any one have plans for or a real (store bought) reactor that we could draw plans from?

Thanks for the help.

Shane