If you do vinyl you'll probably end up with three-quarter inch tubing, which could be fine, but with that you'll have more head pressure. So are you going to do your sump directly underneath the tank or remote? If its under the tank head pressure won't be a big deal. It's a good time to become a plumber. By the time it's over you'll be a plumber, electrician, computer programmer, architect, and chemical engineer. .