Would i be able to put electric yellow cichlids in my pond?

its an indoor pond with real and false plant,a stone waterfall(filter) and a reef made of river rocks.its inhabited by:goldfish(comets,black moor),zebra danios,guppies,algae eaters,swordtails and black snails(came with river plants my uncle found).the pond temperature is set at low to suit both warm and cold water fish.