If possible, I'd put a small power head in there to keep it circulating. Not sure if it's necessary or not. If it's in a sterile container and sealed, I don't see how it could become stagnant...but I'm just not sure.
I got it from lfs it is an aquamaxx that is 36 gl out put but upgrades to 50 with changes. Currently out of mod parts. Running it for 2 days now and so far so good. I split the water line at washer in basement and using a large trash can to hold while it fills then use pond pump & hose to get to tank. Not fancy but is easy.
Making a descision drove me crazy so I just made the leap I am sure in a yr or 2 I will find one I want more..... changes are good right?
I figure after 1st fill when would I need large amount fast.
Good luck