Gate Valve sizing help

El Mujadore

New member
I searched and did not see a thread on this so I hope anybody can help me chose the size of a gatevalve for a new tank install. Its a aqeon 72 bow with a rear overflow and two bottom drilled holes. I going to have a herbie system so (2) 1" pvc, one is the lower main drain with gate valve to the sump and one is purely backup.

My question is for a 950gph pump just below, should I keep it with a 1" gatevalve or reduce it to 3/4" pipe and smaller gate valve. I use a 3/4 on my 120 gallon with a 1200gph pump and it seems to be appropriate size, but I do not know if going larger would make it more difficult to "dial it in".