i have a 5ft by 2ft by 2ft tank with a 6 inch jade eyed cichlid, 16 inch common pleco, 4 inch feather fin synodontis and am going to buy 1 gold severum, 1 blue acara, 1 earth eater. i would like to know what else to put in there either a red oscar juvenile or about 5 silver dollars. or maybe both.