Kanta, I have several pieces of Malaysian driftwood in my tank and haven't had any issues with it. If you soak it for a week or so before putting it in your tank you will have less discoloration from the tannins. I know that my Plecos (Bristlenose & Gibbiceps) both love the driftwood and spend plenty of time making sure it is cleaned before anything else is. I just recently picked up a nice piece of mopani that I plan on using for a 220 tank I am setting up. Will let you know how that works out. The malaysian driftwood does slowly decompose so it will have to eventually be replaced. The pieces that I have in now have been there for around a year or so and are still pretty sturdy.