I like it.
I guess the main reason why I didn't use my old water is because I was switching from tap water in the old tank to RO in the new tank. I wanted to go 100% RO right from the start. I did overlook using some of the old sand to seed the new sand... this is a good idea. The way that I looked at it though is that I was putting in all of my very well established live rock which will also seed the sand bed.
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