Okay, I just did another water change and I rinsed my old BioBag in my old tank water and put it back in. It's starting to look a bit tattered, so I would like to change it to a new one when the month is up. My question is, I would like the NEW bag to already have established bacteria on in when I do put a new bag in there next month. How do I do this? Should I just let the new BioBag float in the water? Should I put the new BioBag in where my old filter is and the filter will have two bags in there? (though I don't think there is enough room for this)