I like the update pics....gives a better view of your fish...very nice and in mint condition..i may not be the best to give advice on this one because i have a lone male midas in a 150 .The tank is in our family room and the hovers tank center most of the time and follows particularly myself as i move in or out of the room...he is around 13 inches and i can not see another fish (cichlid) being in with him...i think your own idea of perhaps silver dollars or maybe some bottom dwelling fish might work...you have a fish without a mark on him... .