Getting cut really sucks. A hacksaw is the best thing to shorten tubes and things. You can try to crazy glue the ends or just use the extension tube attached to the last section of intake pipe. You can take a small bottle and cut the sides out of it leaving some small sections for support, and then stretched hose over it. You can use rubber bands to attach the end of the hose to the intake tube. This will allow water in without worrying about fish getting sucked up until you can get another tube.