Do not worry. don't do anything other than placing in the tank, and weigh it until it sinks.
Best doing in a new tank, without fish yet, turn filters on and leave it several days. Some woods produc e more fuzzy stuff at first, but all is harmless, just vacuum it as needed. Fish best i introduced slowly.
In an established tank, introduce it the same, and watch for needed vacuuming for the fuzzy and don't worry about it.
You may see some staining of the water, but that is good, and goes away with water changes.
Best doing in a new tank, without fish yet, turn filters on and leave it several days. Some woods produc e more fuzzy stuff at first, but all is harmless, just vacuum it as needed. Fish best i introduced slowly.
In an established tank, introduce it the same, and watch for needed vacuuming for the fuzzy and don't worry about it.
You may see some staining of the water, but that is good, and goes away with water changes.