Lizardfishman,
Did you get that dwood at a LFS? You may want to take it out and scrub it. I had a lot of hair algae at one point and I took the dwood out in the sun and then gave it a good scrubbing with table salt and gave it a good rinse before I put back in the tank. And yes a lot of dwood floats at first. Just weight it down with some rocks until it sinks on its own.
Did you get that dwood at a LFS? You may want to take it out and scrub it. I had a lot of hair algae at one point and I took the dwood out in the sun and then gave it a good scrubbing with table salt and gave it a good rinse before I put back in the tank. And yes a lot of dwood floats at first. Just weight it down with some rocks until it sinks on its own.