SS, haha.. I know I know long time... layin low..
You re gonna love what I set up bro. I hooked up an external pump with and also added an extra shut off valve with a hose adaptor along the pvc pipe for drainaige.. And I hooked up the veg system with its own chiller.
You would be proud
You confused me before with pump gph output. You see it depends the upwards length you are pumping to. Tha aquarium pumps for example are rated at 1000 gph at 30cm...
so when i went with a small external pump it was rated at 250gph, so I was confused because it was much bigger than the aquarium pumps, then I checked it rates that at a few meters..
So take in to account how high you pipes are from the pump/rez, measure the height and from their you can actually figure out the draw from your pump at that height.
For example my pipe reaches 160cm above my rez. So, a 1000gph @ 30cm aquarium pump isn't going to give that flow at my height of 160cm. It will be less.
Anways hope all is well.