The overflow can't out perform the pump. The amount the water that overflows is the exact amount that is being pumped in. The overflow can only under perform which would cause the tank to overflow. I'm not familiar with any named methods. He's getting gurgling cause he using a stand pipe for an overflow. Most overflows are made with a large box with slits on top. If the slits begin to clog it just rises the water higher up the slits. The water doesn't have to travel down a narrow pipe. Using an overflow box lets the water just drains at the bottom of the tank through the bulkhead into the sump just a short distance doesn't trap air. If he made the drain pipe flow out the back of the tank instead of in the middle of the tank he could put a small breather down in the middle of the pipe to let air escape. I'd think that look better IMO so you don't see those pipes standing inside the tank.
thanks for the infor , i added the overflows for 2 reason inside the tank , i went with clear pipe so i could see the water flow threw the pipe , i thought it be cool too see the water moving downthrew the tank (( which once i got the tank full and did , i like it , well me and my woman ,lol )) i the overflows are not really in the middle they my look in middle , but only few inches off the back wall , i went a few inches cause the fish could swim behind them , i didnt want it only inch of the wall and a bigger fish trying to squeeze by it and get h stuck .... and yeah they would try , like a huge woman wearing a 2 peace bathing suit , never good sight lol jk ,,, and i didnt like the thought of haven the tank 3 more inches off the wall , i know its only few inches more , but few inches more matters , ask any woman lol lol jk , but thanks for the infor again
