Alright some of you may have read before I am going to be starting my very first SW aquarium, due to a shortage of LFS in my area I was forced to buy a tank from Petco and unfortunately its not predrilled or anything. I did make sure that the bottom was not tempered glass(will shatter if drilled) However Im not sure if i want to take the route of drilling it or getting it drilled through the bottom. Is there another way of getting the water down to my sump without a hole in the bottom? I did see some of the hang on the back siphon type overflows which from reading i see they can and will lose siphon once in awhile. So I guess my question is can I drill the back of the tank for an overflow without the overflow? 2 holes one for a drain and one for a return? If so what are the pros and cons here.