Hey there Kyle,
So the plumbing for the interior of the overflows will be supplied with the aquarium as well as the bulkheads that will go through the bottom of the tank, from there all of the plumbing necessary to get your tank running will be supplied with the sump as vinyl tubing and barb adapters and whatnot.
As far as what size and how many, your aquarium will have two overflows.
Each overflow will have x2 drains and x1 return.
The drains will be 1" and the returns will be 3/4".
The bulkheads will be 1" slip.
Let me know if you need any other info regarding the plumbing.
We can certainly subtract the cost of the original pumps and put you into something better like maybe a DC Controllable pump, we have plenty to choose from, I like Current USA, Sicce, and maybe the EcoTech Vectra.
Let me know what you are thinking, we'd just have to chose the right GPH.
This is the email from Fish Tank Direct. My aquarium hasn't been made yet. I can change things if needed. Any and all suggestions are welcomed. Thanks in advance.