How soon would I see tannins and brown water when soaking driftwood? I have a small piece, and I've been soaking it in the same water... about 1.5 gallons, for 5 days. The water is hardly discolored at all... would I have seen lots of discoloration by now if it was going to leach stuff out? Or, since there's practically no discoloration, can I assume it'd be fine in a tank now?