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The SAEs are always pretty much mid to higher level on the amazon swords eating algae. Unfortunately, the tank is 25" high and 12.5" wide.With the Rams, the SAE, and ten cories already, I'd say you're running out of real estate. Unless that 60 is only 12 inches high.
I'm thinking between 4 to 6.I'd say you definitely have space for more Corys (not many bottom dwellers and filtration is good). I can't put my finger on a number though.