My buddy needs to downsize his tank. I'm inheriting the old tank and adopting a few of his fish and getting him a smaller tank. My question is what do you guys think is the most efficient safest way to do this? Can we just take out sand rock and water transfer it to the new smaller tank and relocate the fish or should we give the tank a few days/week? I'm not worried about the rest of the inhabitance that I'm taking since I will be putting them in my 90 and his old tank I plan on basically restarting with new sand and maybe a few pieces of rock depending on what he gives me. Any advice from anyone with experience would be appreciated since I have only ever set up new tanks and never did a move. Thanks in advance