Looks like it might be a bit too big for my tank, too. Should be good stuff to use though. Looks like it may be a mix of stuff but those upper parts do look like they should be dry. I find lots of wood that has washed up and it rarely has tannin but is a problem to sink. For my use, it is not much trouble as I have really hard water and limestone is so easy to find. I find drilling holes and plastic ties is an easy way until it does decide the time is right. Not easy to rush nature!