I've decided since it's easier on my back, that I'm going to stagger my water changes so I do only one or two a day. Yesterday I did my 3 gallon, today I did my 5 gal Sterilite and 10 gallon, tomorrow I'm doing my 5 gallon tank. Then on Friday I'll do my 3 gallon AGAIN and on Saturday I'll do my 5 and 10 again. I only have to do the 5 gallon glass tank once a week since it's filtered and cycled, thank God. So I've finally come up with a schedule that works for me. It's so much simpler than doing them all in one day. Less pain for me, and I feel less overwhelmed. I wanted to make sure I could handle it all before I get a hamster or mice in the near future. I don't want to start slacking off in any of my fish's care.