We suggest that you soak and or boil the driftwood before putting it in your tank as it will release tannins and make your water look brown. While it is unlikely that the Malaysian wood will float, theres always a possibility so you need to soak it first in order to see if it fully sinks. We like to put them in a bucket and leave a brick on top of it to make it sink if they dont immediately sink. Anytime you add new driftwood to a tank it generally will get a clear jelly like substance on it initially. This is normal. With time it will go away, many fish eat it off as well