Thinking Ahead

[SUB]I'm already beginning to get some things for the large tank I'm getting between December and February and while I was walking through the woods today I browsed the "driftwood" (mainly severed large roots) selection and brought back quite a large piece. This piece won't even fit in my 75G because of width and height but I think I'm going to put it in the big tank (the massive tank will have dimensions of either 5'x2'x2', 6'x2'x2', or possibly 6'x3'x2'). Hope you guys like it (by the way, that white thing behind it is a full size propane tank).
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I have a few questions for you guys about this though to figure out whether I can and/or should use this piece.
1) How long do you think this'll need to soak to eliminate tannins and to just plain get it to sink? Also what are some things I could soak it in?
2) It's mostly hollow. I feel like that's a good thing since it'll give a hiding spot for fish and it'll take less volume. I also am afraid if something gets stuck in it and dies how am I going to get it out. In your opinion is it being hollow a pro or con?
3) Any idea how many gallons that'd take up?
Thanks for addressing my questions.

Just measured it. About 46-48" long from tip to tip, 18-20" wide, and around 24" tall.

predatorkeeper87 said:

dive, did that come out from being submerged or was it actually in the woods?

I soak all my pieces in a salt brine, call it peace of mind with any living critter that may have been on the wood.

As for time, my peices that I gathered 5 months ago are still floating haha, it depends on the wood, if its waterlogged already, all that stuff

Click to expand...

Wasn't submerged, just found it by some trees. Yeah I think it'd be a good idea to add some salt to whatever I soak it in, I don't think I even have a container that big! If I can't sink it in time for the big tank then I'll just save it for the pond, give the bullheads something to spawn in .