My dad gave me this idea to hold the drift wood under. He said maybe if I drill a hole in the wood then put a stainless steel bolt with a nut thru. I've read that stainless steel doesn't rust but is that true? If not is there any safe nut and bolt that's not going to leach into the water? Also I would burry they bolt under the sand, I'm thinking of this because aquarium glue and rocks havnt worked well for me in the past.