get rid of those chiclids. they only do well with other chiclids. dang, what a horrible combination of beautiful fish.
Wait... did you say you have a Gourami?
these guys stripped my long-finned black tetra Jerush of his fins, and were general bullies in my tank. I finally caught them in the act and donated them to the nearest Pet-Co - but only after my favorite Jerush had been stripped clean of fins and was missing a few scales. It's now been almost a year since I ditched the Gouramis, Jerush is happy and fully-recovered, and the rest of my fish have gotten over being bullied. I couldn't believe how active everyone was in the week after I ditched the Gouramis. I had no idea that they were so disruptive.