So i just recieved the D5 pump and a lot of people on this forum said that 7/16" masterkleer tubing would be perfect. The tubing doesnt even get close to fitting on the D5 pump? ive heated it up and even cut a slit at the end of the tube, thinking i would just tighten it up with a clamp. Nothing worked, not even close to fitting, so i guess im going to go buy 1/2" tubing? will that fit?