06-07-2013, 11:33 AM
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Waterlogging to the point of complete, stable sinkage takes a considerable amount of time and, for some pieces, never fully occurs. Given your time frame, I would suggest either anchoring the wood to a piece of rock that can be secreted in/under your substrate (ie flat shale) or constructing your scape so that you are using rocks on/around the wood in such a way as to hold it down. I have both appraoches in use in the tanks in our home. Don't panic at the idea of burying your nice wood under a pile of rock, placed correctly it actually takes very little contact/size of rock to do the job - it just takes some trial and error to get it just right.