Wet Drys are notorious nitrate producers... just because you havent seen that result yet, or perhaps your LR is keeping up. People can have nitrate problems for a variety of reasons beyond a wet-dry, so to deduct that wet-drys must not be part of the problem is not accurate.
You need to talk with Bornemann, Calfo, or maybe Holmes-Farley. There is plenty of work on the subject... bio-balls were designed to convert ammonia and nitrite to nitrates. Its part of the process. Part of that process also results in the release of phosphates by the aerobic bacteria.
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