This was just a thought. Is there anything wrong with doing a 20% waterchange every other day? For example, mon,wed,fri? I have a big piece of driftwood and I boiled and soaked as much of it as I could and just put it in my tank. My water has a brown tea dusky color now, so I wanna do frequent water changes to remove as much tannins as I can.
I have never had tannins leak into my tank, and I have never boiled the wood and 2 pieces took a week to sink. I just have always had purigen in the tank.