Stay away from Pine for obvious reasons and only used "aged drift wood". Look for pieces that looks like it's been sand blasted with no bark etc. the smoother and cleaner a piece looks the better. After gathering your wood bring home and soak them in a bin of salt water, I use lots of salts to help clean and kill any unwanted bugs / parasites that maybe hiding in / on them. Let them sit for a good few days fully submerge in this salt water, then remove and rise well with the hose before adding them into your tanks. Also note that the driftwood will likely bleach into your water turning your water a tan / tea color, don't worry about this and with normal water changes will end in time.