I am planning on switching from a 5 year old 29 gallon aquarium to a new 46 gallon bow front aquarium. My question is, will I need to start over/cycle the new tank before adding all of my fish? I read online that I'll need to add about 80% or more of my old tank water to the new tank.... along with the old gravel, decor, plants, fish, ect. Then fill up the rest with fresh water. I'm scared all of my fish will die if I add all of this into a new tank. I've never switched before & I don't have the room in my house to run 2 big aquariums at the same time. Any help/advice would be greatly appreciated!