Thank you for all of your replies! It's really fun to see how you all turn these problems around and find good solutions. My plan is to set up a tank in the gallery right now, fill it with water and let it sit over night. Once I install the system, I am going to fill the biofilters and as much of both tanks with that water. (the water authorities claim that we only have chlorine, not chloramine in our water)
After that I will add ascorbic acid to the tanks once I fill the remainder with water. (how much should I add to each 75 gallon tank?
The fish move in on Friday and the performance/reception is on Saturday night.