You could do an angelfish, a dwarf gourami, which I would suggest Honey gouramis (they also come in Sunset honey and Golden honey color varieties), with a school of 6 tetras such as cardinals or rummy nose, 6 Panda Cory's, and 1 or a pair of Bolivian Rams only if your going to set the tank up with plenty of plants to break up the line of sight in the tank. Another reason I'm suggesting Bolivian rams is they tend to be much hardier fish. GBR's shouldn't be added to a tank that is less than 6 months old as they don't do well in newer tank setups. But both GBR's and Bolivian's are nitrate sensitive so weekly WC's of 50% are highly recommended.