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The increased flow should help keep things 'suspended' better and more available to your skimmer. Assuming you have a sump, have you tried a filter sock. They need to be cleaned on a very regular basis too but can help in getting larger suspended particles out.
In any event, short of a massive water change you nitrates are not going to come down in a massive steep decline all at once. Even with the water change it will depend on what is in the tank to decay (in the rocks, corners, sand, overflow, sump, etc) and the quantity of what you keep adding in.
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