Boiling the wood will break down the fibers and it will rot and disintegrate much faster. It's really best to pour boiling water over it, then scrub the nooks and crannies with a toothbrush to try to remove any offending nasties.
Could we see a photo of the tank?
I'm afraid I could only read so much of the initial post before I started to go cross-eyed. If you're going to copy from another forum, at least have the decency to clean up the text.
HTML issue hopefully resolved please tell me if its not fixed. Apologies to those of you who took the trouble to read through that garbage and answer anyway. I just have to take the dog out for a walk before darkness falls and I will reply to your questions/comments. Thanks.