I bought a piece of driftwood from Petco. It was labeled for terrariums and reptiles, and it is a piece of grapewood. I figured it would be okay for my tank, (didn't bother to ask an employee because they are idiots there) took it home and boiled it, let it soak for a week, and now it looks ready to go in. My question is, do I have to scrub the bark off first? It flakes and peels off in strips, and wasn't sure if this would be harmful to my pleco. Also, how much can I expect this to change my PH? It is about a foot long, and about as big around as a coke can.