I was going to go with racks but the gf says normal rats will chew through the mixing bins in no time and won't allow it, so I'm doing tanks too. If I had to lift big tanks it would be a huge pain but I'm only really using 10 gallons right now. I figure I'll have one female in a 10 gallon and I have a 1.1 pair of asf in a 10 gallon (will hold back a female later to grow out). It's not as convenient space wise but still easy to lift them and clean them out. I just want to figure out a lid for the tanks now where they can't get out but it's easy for me to take the lid on and off and hopefully have a food hopper and water bottle holder so I don't even have to open the tank.