If you still end up with some yellow coloration in your aquarium even after you've pre-soaked your wood, a small amount of carbon in your filter can remove the coloration. Until it becomes waterlogged, most driftwood will want to float, although some types of wood are denser than others and may naturally want to sink.

Why is my driftwood not sinking?

To make driftwood sink (and not float) in an aquarium, you'll have to hold it down until it's completely saturated or put some extra weight on it. ... Therefore, to sink your driftwood, you will want to make sure the weight of your wood is more compared to the upthrust exerted by the water column.

How do you stabilize driftwood?

Preserving driftwood isn't particularly difficult, but it does take some time and patience. You can either clean and bleach it to preserve it in its natural state, or go the extra step to seal it in oil, resin, or varnish to preserve it in a protective coating.