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I kept a sponge in my sump for this purpose. It never had quite enough bacteria going to cover the qt tank's denitrification needs.
I now use some seeded crushed coral in the catridge bags of the hob filter and a few pieces of seeded rock from a fish only tank I keep. Obviously if I leave the rock in there during treatment I need to be careful where I put it later. I also run a little carbon when not treating.
I'm not woriied about nitrate or nitrite in the qt tank since it is only used for fish and keeping these media do not add to nitrate load in the main system. I don't necessarily think keeping a sponge would add much nitrate .As long as it was submerged I don't see how it would differ from rock or substrate relative to nitrate production.
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Tom
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