Water isn't too hard for fish to live until it gets up in the 10 pH range. As long as the tap water is safe for humans, you know it is safe for fish.
Nitrites must be at zero if the tank is cycled. After the cycling is done you should NEVER see a fluctuation unless you change the filters or clean to vigorously. There is no safe range for nitrites above zero.
I suppose its not possible to get his 125 gallon tank right away? It would save you another move. This is one reason why I always fight so hard to get people to buy the right size fish for their tank regardless of plans to upgrade in the future. It might be easy for humans to upgrade in the future, but not for the fish.
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