I fought high nitrates for over a year. In the 20-25 range no matter what I did. Tried bio pellets tried vinegar dosing. Still in the 20's. Finally tried a marine pure block in my sump.
Now 2-3 months later nitrates are below 5 for the first time ever. Still dosing vinegar but it's the block that has made a difference. When I first placed block in my sump, my scans were ****ed off for 3-4 days, shrunk down and stayed closed up. But then slowly expanded and seem none the worse for wear. I am convinced that it has made a positive difference in my tank.
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