I am looking for something with less tea color effect What about the cholla's mexican wood? I saw people sell it as driftwood. Yet our local crafts store sells nice pieces for like $5
Basically all wood will release that color. But you can make it put out a lot less by boiling it first and then using carbon in your filter. Some people even like it for a more natural look.
Mopani will sink really well. I like it. It will only release the tannins for a little while. Soak it first, change the water, soak it again. When it slows down, put it in the tank.
Mopani works well and it will leach tannins no more than any other wood. use some activated carbon if you dont like how it looks. It will clear it and then remove the carbon. Even a dark tannin wouldnt bother me and it will clear on its own anyway so id leave it alone just for the sake of not doing more work. Boiling would be a pain and it would smell like wood in the house. Ive done both......leave it alone!!!!