The bigger the container, the longer it takes for the water quality to deteriorate.
If you're looking for fast growth and good color so you can unload these as quickly as possible, I'd personally go for as big containers as you can fit.
You can certainly make smaller containers work, but if you go with cups, I think you're looking at multiple water changes per week to avoid stunting their growth.
Fry/juvies especially are VERY sensitive to water params.
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