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Depends on what kind of lighting you have and how much effort you want to put into keeping plants. For a lower light set up, plants like anubius and crypts are great. You could also add some floating plants like water lettuce to give some shade to the fish.
My Cory's love my cabomba. I have a very basic light that came with the tank and add no extra nutrients for plants and they grow like crazy! Lovely soft feathery green beds for the Cory's.....mine constantly clean them for leftover food and then perch/rest on them