12-01-2010, 01:04 PM
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well gouramis would do fine with smaller fish as long as they dont bother him, but he might eat your fry. As long as they dont inflict real damage, ie torn fins gashes, they should be ok. Heavily planting the tank or adding floating plants will also reduce aggression since cutting the line of sight often deters attacks.
When i was like 12, i used to chase my "aggressor" fish with a net when he attacked my other fish as punishment so how him what it was like to be chased. he died shortly from stress. Pulling a fish out of the water and moving it will do the same thing, even faster than chasing since they would continually get damaged slime coats and would have to acclimate and reacclimate every time you move them