I recently purchased 5 of these guys from a lfs , They are very aggressive towards each other and I am now down to 3 is this type of aggression normal? I currently have the ellioti in a planted 40 breeder. they are housed with a school of rummynose tetras and a school of dwarf rainbows, 3 roseline sharks , some zebra loaches, 3 siamese algae eaters, 3 panda garras, and 2 gold gouramis. Any advice or suggestions would be greatly appreciated