Well after doing some soaking in hot water, cleaning, more soaking for 24 hours, it sinks. and it is definitely some hard wood though.
I have it in a cooler right now with steaming water with the lid closed. If it doesn't leak tannins over night, would be good to throw in the tank right away? The water it was in overnight last night, didn't have any oily substance on the top at all or does it take longer for this stuff to leach out? We have had a couple good amounts of snow recently so it has been pretty well soaked and then dried out and soaked and dried out again and now I soaked it last night.
Thanks for the help everyone.