I recently purchased a Penn Plax 40/55 gallon undergravel filter for my 60 gallon tank. The uplift tubes seem short for the tank, and don't quite reach the top (see pictures). The directions say the tubes should go to almost the top of the water. Will this work? or will I need to somehow figure out a way to extend these? Thanks. Disclaimer: setting up my first tank, have read a couple books but don't know much.