There is a product out there called a denitrator which helps to remove the nitrates out of the tank. I have one running on my tank. I just have to feed it 20 ml of vodka every thursday so that the anerobic baterias can convert the nitrate to nitrite which then basically bubble up and out of the tank.
I've been testing the tank perameters on a weekly basis now for the past couple of months and havent had any nitrate show up on the test kit.
however, that said... I also have a 18 inch sand bed in the sump to help the mechanical de-nitrator. Before the denitraor, I was still showing nitrates, after adding it... its been great.
And if there is an alcohol shortage.... you can always take some of the vodka... The fishes never complain. :wink: