Thanks for the replies.
I will stock up on the leaves and probably add 1 or 2 every time I water change. Plan to keep bio load low so I can cut down on WC (but hard lah).
My driftwood are more than 10 years old so whatever tanin is gone. The big pieces in the tank are bog wood and those don't leech much. Maybe this weekend will go Sungei Tengah walk walk. I remember one of the orchid farm ( I think Woon Leng) use to have a lot of driftwood. If not then go pick leaves again.
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