Scott are you siphoning bottom, anoxic, nutrient rich layers? If so, should help with water quality issues [if any exist] when you refill later. Lusk/Eric often recommend removing a few feet of bottom water with siphon if one suspects quality issues...so that's going in your favor.

Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau

[Linked Image from i1261.photobucket.com]