I tried sugar dosing to drop nitrates and phosphates. It works! I had extremly high nitrates after moving and resetting 2 tanks I bought used. I am talking off the chart nitrates. 3 days of sugar dosing got them down to around 40ppm then I did a big water change and took it to about 10 ppm
. One more sugar dose zeroed out the trates.
You must have a good protiene skimmer!! The skimmate comming out of those tanks was alot and realy grose. Problem solved tho nitrates are 0ppm phosphates are trace at most. I do not dose any more I only did it short term to get the water perams under control. Now regular water changes keeps it in check.