You may have all one gender if they all look identical. How big are the regular (not the dwarf) gouramis? If they are fighting like that then there is a possibility you have a couple of males.
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125 gal - Planted Discus tank, 60 gal - Planted Asian tank, 46 - BB Discus, 37 gal - QT, 10 gal - Planted Endler tank, 2.5 gal Nano Planted, 1.5 gal - Betta
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