Actually, that reminded me.... that nasty boiling business was what I initially thought was a Malaysian driftwood but was actually a mopani piece. I boiled the Malaysian piece but not as much and I don't recall if it was as bad.... it mustn't have been or I would remember it better.
I'm going to take note for the third piece as I will boil it and see.
I boiled mopani before. No how many times I boiled it, changed the water, and boiled it again it leaked dark tannins. So I got fed up and just chucked it into my tank. Might have taken a few months before water changes saw the water turn clear but...I'm getting off my point.
I no longer boil wood. I soak it if it doesn't want to sink right away, and then chuck it in. It's not that big of a deal really with the tannins. However I do have one large piece that succeeded in changing my PH down to 6.3 because it leached so badly it turned my water gold. Fish didn't seem to mind though!
OP don't worry about the water turning colors unless it's a massive piece of wood. Your fish don't mind and given time it will clear. I've heard some people use carbon during this process to help soak up the tannins. Just make sure what you have is Malaysian, and not Mopani.