It's been on the beach for several weeks and I'm not planning to use it right away.I am more concerned about the type of the wood as I know not all types are good for aquariums.I used wood in my fish tank before,but were small pieces.This one would fit very good,but if I don't get any positive opinion I will renounce to the idea.
Thank you very much for your opinion.
As I recall, there is an involved process in preparing wood for an aquarium involving boiling and soaking it in water for several weeks. If I understand it correctly - you should be able to prepare just about any wood this way by forcing all of bad stuff out. The boiling works similarly to making tea if I'm right.