Hi guys, I'm after some suggestions of potential stock for a 450 litre tank iv got setup, currently I have a featherfin syno around 4 inches, and a gold severum around 3 inches, not too sure what else to put in with them to be honest, have considered an oscar or a green terror as a possibility but not sure... should I also look at another severum or do these guys go ok alone? I've had Africans before and turtles, but these guys are new to me so hoping to tap into other peoples experience