I have a real nice piece of driftwood and I've been soaking it for almost a week now. It doesn't seem to be letting up on releasing tannins.
I know tannins aren't really dangerous but a pH drop could be. I have some crushed coral I could add back to my canister to try to buffer it a bit. I don't mind the tea stained water that much, I figured the frogs would actually prefer it so long as the pH remains stable.
I'm actually using the tannins released from the wood for water changes in my cardinal tetra/corydora tank since they like that kind of water.
What do you guys think? Would it be risky to add this wood? I am thinking about getting a large tub and letting it soak out in the summer heat / hot water and then adding it to my main ACF tank in the fall. I'll post some pictures and it's a really really nice piece!