I got a 265 gallon tank with a 90 gallon some on craigslist. It has four holes drilled across the bottom so I planned on having two overflow and two for returns.
After going around finding different connections and pipes that would work I hooked up the two overflow, put the pump in the sump and just put the hose over top and into the tank because the returns weren't set up yet. Turns out my two overflows can't even keep up with my 1200 gph
pump. The threaded bulkhead fits a male 1 inch pipe. There are two elbows for each overflow line and they fit the threaded 1 inch pipe. It gets pretty tight inside the elbows probably not even an inch inside diameter.
I was going to get an adapter to screw in the bulkhead in the tank to allow me to put on a 1.25 or 1.5 inch pipe for the actual overflow inside the tank. The width inside the bulkhead is just about an inch, so even if I find adapters that fit and make the pipes and elbows bigger would it really help that much since the the bulkhead is still cutting it down to one inch
What I plan on doing is just to hook up another overflow. Does anyone have any suggestions towards increasing my flow?
I will put up pictures in a moment