First of, THANKS!!! great thread and awsome design. Quick question here, I want to use this design with a coast to coast inner over flow box with a 6" height and 4" deep,would a short inner leg work, instead of the entire U portion inside the tank an L shape inside the coast to coast OF box?? Sorry if complicated to understand , my english is not so good LOL. This is dues to not knowing yet if I can drill my Oceanic 75, It has a label on the bottom that says tempered, but have NO clue if the back and front pannel are also tempered. Thanks in advance!!!