So, I just purchased two pieces of driftwood for my soon to come planted tank. Well, I thought I had planned everything out very well, but apparently not, since I now am faced with how to keep the driftwood down. At first I thought I had read something about keeping it submersed long enough would weigh it down and keep it from floating, but after a couple of hours in a sink, they were still floating. I have thought long and hard about how to keep them at the bottom, but I still come up blank. I can't think of anything to tie to them to keep them down, does anyone have any advice/ideas?