drilling tank and need advise about overflows

Hey guys. I scored a Oceanic 125 gallon tank and stand for free here this last week. Its an all glass aquarium and im looking to drill both corners for overflows. my question is, after I drill them and run my hoses to the sump and back, what do I put inside the tank?? Is there a diagram that shows how to build the drain part, and the return parts inside the actual tank itself?? Im kind of lost as to what to do there.

 

You have to drill both corners and then use bulkheads in the hole and then inside the aquarium you will need a 5x4 L shaped acrylic column siliconed into the corner to make a Box for the water to flow over and behind to get to the drain to sump..Theses 2 overflows have to be completely water tight and sealed a 100% or you into a flooding problem. Oh and if you are 100% sure its an Oceanics tank then the bottom can be drilled unless its marked otherwise

 

its got an oceanic sticker right on the front. I didnt see any stickers on the glass anywhere other then up at the top, which has a build date of 08-xx-01. Ill run out and look for any other stickers on it right now. Thats awesome if I can actually drill the bottom of the tank Will be much easier. I know about the bulk heads and the boxes in the corners, but my question was the actual piping inside the tank. What do I use there? Like a stand pipe or what??? I know I dont just leave both holes open.

 

Yeah you could (should) use a standpipe. check this out. its instructions on DIY Durso style standpipe or ording info if you dont want to make it yourself. http://www.dursostandpipes.com/?page_id=58

 

PERFECT!! Thanks so much my friend!!! thats exactly what i was looking for!