Mine was calculated on a 1" bulkhead dumping 600
gph into the
sump, with 9" of linear overflow length. I have two 1" overflow bulkheads for a total of 1200
gph. I have a Rio 2500 pushing about 490 to 500
gph back up. All of the calcs were based on the calculators available on the side bar of the main page at
www.reefcentral.com. Here is a quick link to both of them.
Drain Line Calculator Head Loss Calculator
The head loss calculator tell you the approx
GPH after taking all of the piping bends and vertical flow. In my example the RIO pushed 748GPH, but due to head loss, I only get 490-500 out of it.
I think most of the bulkheads on the 75 gallon tanks are 3/4" and typically you get one supply and one return bulkhead. I would suggest you look into the different methods of handling your overflows and returns, There are things called Durso's, and Stockman Standpipes (both are modifications from the standard issue tank overflow piping) that cut the noise of the tank down tremendously. I just got mine running (all holes and piping from scratch) and it is quieter than the fans on the
PC I am typing this on. You can see what i did in
My Tank Journal.
I have done alot of research and I am willing to answer any questions I can, just let me know. Good luck and welcome to
Talking Reef!
