11-14-2010, 01:05 PM
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Have a read of the profile of the Blue Gourami, it explains what previous members have mentioned about aggression and how to prevent it. Notice also the info on tank size; smaller tanks frequently bring out aggression more. Click on the shaded name in posts to see the profile, or use the second tab from the left in the blue bar across the top of the screen.
Although it can vary from fish to fish, the male gourami is an aggressive fish and will take its aggression out on other gourami as you're noticing. This is highly stressful to the other fish, and they will develop health problems as a result and possibly premature death if it is bad enough. The aggressor should be removed, there really is no other option; you cannot "teach" such a fish to be nice.