Yes, that set up would work temporarily to house fry, but not for the 2 to 3 months they would need to become of age to sell.
You can house the entire hatch of fry in the tub up until the males start to show color. Once they do, you can add them to cups and add cups one at a time to the bin. As long as water circulates and they get lots of fresh water, they should be fine. It is tedious, however, to take off lids for multiple fish unless there's a hole to put food through.
Again, never in a million years would this work for a permanent placement/tank for each fish, but for temporary housing, yes, it would be fine for fry that have colored up and started fighting. The females, of course, can stay down in the tub itself.
I always used a 2.5 gallon tank for the spawning, and then a 10 gallon tank after the fry are about the size of a baby guppy, and then a 20 to grow up further in until they start to fight, which is when they go to their individual spaces or get sold, but that's just me.
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