How Many Corydoras Can I Get In A 10 Gallon ?

How many is a few platys? You might be overstocked already. You might be able to get some kind of dwarf cory, but the problem is you should get at least 6 for a happy shoal.
 
I think you are already fully stocked, since I see at least 3 platies in the picture. I personally would recommend getting rid of the platies and getting a nice shoal of pygmy corries since the corries and the tetra are lower pH fish relative to the livebearers which are higher pH fish.
 
I think neon tetras and platies both need a 15 gallon.
 

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