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well im kinda a beginer but i would fill up the new tank 3/4 of the way with new water and use the rest out of the 39 to fill it. then if posible use old filters in the new tank to jumpstart the new bacteria.
I would start a net bag of filter media in the old tank for a week or two while you are getting ready to make the change. That helped me when I changed mine.
Sorry, was at work. Yes you can use the plastic netting used in the grocery produce dept too (for onions or citrus, etc.) I used a bag and put some of the ceramic rings into it last time. Also have used large package cut to size filter pad. Fish stores also sell nylon bags large and small. Never used nylons but they should work good too.