Thanks for the reply, that's good news. I don't know if I could even find the spot I picked this up at, the area is pretty dense and right now you can't step on anything but fallen wood and leaves so it's pretty jumbled.
I hadn't gotten any replies so I went ahead and prepped the wood from the 3rd set. Soaked for a few days, put it in the oven for 2 hours at 250. Soaked again for a day then into the tank.
Seems to be working well. I anchored it to keep it down and after some trimming it looks like this:
still needs to be adjusted and centered a bit but I couldn't get it anchored anywhere else. So it's got to wait until it fully sinks.
Thanks again for the help!