aquaticmagic sells the bamboo caves, they are burned and black in color, i guess to seal them ?
i have read up on bamboo in aquariums several times and seems everyone has there own opinion on it lecching or falling apart in the tank if left natural and dried out.
id like to know how to keep it in the tank an it not rot. the marine grade epoxy or fiberglass resin would work but it would be shinny , plastic looking and not cheap.
this post should be moved to the diy forum