Yes you can.....that topic comes up much later in the thread, and some has to do with the plumbing layout some people have to use to get things routed to the sump......But honestly if you'd have the opportunity or chance to flow the tank before you get it to it's final resting place you could all but have it set before hand......
I do recommend using TruUnion valves, and through a bit of conversation with Corey who as well is running something very similar if not the same, it would make life a little easier if you put a gate valve there.....Some might not warrant the added expense of plumbing a gate valve there, but when you start trying to fine tune in small increments for water, it would make life a lot easier.....Also with this system don't think you give it a little tweak and expect it to adjust ASAP....Takes a minute (maybe not), but the adjustment isn't instant.....So be patient.