80 gallon tank

So I am setting up an 80 gallon for goldfish. I was thinking I wanted 5 goldfish, with some tank mates. What are my options? Ph around 7.4 and hardness tends toward 110 ppm. It would be an unheated tank, so think 68 to 70 °F. I was thinking 3 Hoplo catfish and a BN Pleco.