i am up grading my tank to a 40 breeder and this is a little drawing i made of my plans so far. what do you think? what size tubeing should i use? the sump i plan to use is a 20 high, i know not the best tank for a sump but i have it laying around and it's better that a 10. as you can see i plan on drilling the tank. my main doubt is about the overflow since i have never done one through a bulkhead and everything.