Yes there are drw back if you do not have the right size tubs and the tub is too big you will have a hard time getting your hatchling started, there is a reason why every breeders start their hatchlings in 6 quarts tub or V18 it's because they are cramped providing the necessary security needed for young hatchlings out of the egg.
Sure you can use a 12 quarts tubs but don't be surprise if you have issues getting hatchlings started.