These are beautiful pieces that would make a great edition to any tank! Perfect for attaching moss, Anubias, java fern, or buce to! You can also use these in reptile enclosures in addition to fish tanks. 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. Boiling driftwood helps clean it and more importantly helps it be able to sink significantly faster if it doesnt sink initially. 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