I think the tubs are #5 but check to make sure. The tubs are from like 58 quarts to 66 quarts so 14.5 to 16.5 gallons but they have bigger ones but I didn't check how many quarts they were. I'm not sure the brand of these ones but the ones I've used are the Sterilite for my big tubs and Rubbermeaid for my jars and I've never had a problem.
Okay, you have used rubbermaid and not had a problem? I know people that have used rubbermaids (not for bettas but for cichlids)and they all died