hello all. I have had a marine tank for about 6 years. I want to change to an octopus tank. I have a bunch of questions. I used copper safe a few years ago. Will this be lethal to an octopus. I live on Long Island NY, can I use tap water that has sat for a few days? should I put a carbon bag in the wet dry sump? Is the Bimac the best choice? How often should it be fed?