Yeah, Tiger Barbs and serpae tetra are like that, once a dominant is found, they play around, and calm down the fighting. The gourami is just being itself, but he should calm down with age.
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My Tank
38 Gallon: Tiger Barb x5
Serpae Tetra x6
Blue Gourami x1
Bloodfin Tetra x2
Gold Barb x1
10 Gallon: Gold Gourami x1
10 Gallon: 5 Shiners (Wild)
   
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