Thanks for the input, recreating the conditions sounds reasonable.... I figure if it were just a 10% WC last night mathmatically there should be a minor lessening of nitrates after a 24 hour period, but now the fuge is back online, if there is any substantial reduction of NO3, then that would validate my theory a bit more.

Once I get things settled back down to 0's across the board I'll try taking the fuge offline for short periods of time and see what happens.

The thought just hit me, since I can isolate where the water enters and leaves the fuge itself I want to run some nitrate tests there as well..... might yield some interesting results.

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Pro2K are you following this thread? Might provide a bit more insight for your new setup and how and why a refuge was recommended.