Well I figure after an hour or 2 of 10-20% water changes every so often the actual volumn of store water is tiny and not worth worrying about. If it is a super worry then it is time to dig out the quarentine tank that you may have read about.
I suppose that makes sense. And if I'm getting the fish from the same store, they would be used to the water anyway. Hopefully there's nothing nasty there I have to worry about. I'll just make sure that their fish and tanks look good which they did the other day.
I tested the tank tonight and the nitrites are at 0.1 or even lower. Just the faintest blush of pink in the water. Ammonia is still at 0. I see fishies in our tank this weekend! Yay!!
I've also got wine brewing here which is on its way too. Just one big chemistry experiment in our house lately.