75 stock list suggestions?

Hello, I have a 75 gallon tank with a sump that pushes 800-900 gallons of water an hour. I have one full grown Red Oscar, two Convict Cichlids, and one foot long Pleco. Now my local Petsmart had a sale and I think I went a little crazy. Anyway I've bought juvenal Jaguar Cichlid, Green Terror Cichlid, Tiger Oscar, and two Fire Mouth Cichlid. Is my tank overstocked and if so which fish should I move to my 55 gallon that I have standing by?