I have been given several really cool large peices of driftwood mounted on slate and some coral. I would love to use them in one of my freshwater tanks, but, they were in a saltwater tank. Can I use them? How would I clean them? Would they be safe for my fish? Also my lfs guy told me that i can soak the peices of coral in a bleach solution for 24 hrs, then in clean water for 24 hrs, then rinse it off and it will then be safe for my freshwater tank. What do you guys think, would it be safe?