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yeah, any schooling fish...danios, tetras, cory's etc. enjoy having many of them to swim with, it mimics their natural habitat, sometimes in rivers where Corydoras can live you might be able to see a school of hundreds move across the river bed
yeah depending on what size tank, if it is 5-10 gal then 3 is enough 15 or 20 then 5 and 29 or higher 6 or more, but really its up to you becasue zebras are very very hardy