I want to make sure that i have all the correct parts the first time around. Just got my SC Aquarium SC-150 Rimless Reef tank, Stand, and Canopy. Since my tank has been custom pre-drilled from SC Aquariums for a 20'' external overflow box just want to make sure I need a couple of things Should I buy the internal and external custom pre-cut Sch 40 PVC pips that you prefabricated for your boxes on your website? In regards, to the Overflow Internal Pipe Kit 1. 1.5" PVC (RED) × 1 ? Overflow External Pipe Kits 1.5" PVC (RED) × 1?