Moving your Tank... Good or Bad

[Aquattro]

As for water, new or old is fine, as long as it's a close match. Old water doesn't have anything in it you need other than the critters are used to it. If you do regular water changes, using all new water is just like a really big water change. If it's easier to have new water waiting, do that. If it's easier to keep the old stuff, then go that route.