i have prolly 5 rubbermaid setups for temp homes as well, luckily my mom likes to be organized and prolly has 30 in the 40 gallon range, so i just through in all my pairs and new fish in there for a week while i get my new tanks cycled and stoof, some rubber maids are annoying because they have little holes where the handles are so the hangon filters are like 4-5 inches off the water, should be fine if you have you filtration, not sure about with just a bubbler never tried that before maybe if you changed water a ****load like every 6 hours jsut to take it safe do like a 40 percent water change with clean water not right out of the tap