Hi, so i'm new at this whole aquarium thing. I just set up my aquarium two days ago and got my first starter fish. I got two Hi Fin Black Skirt Tetras and 2 Gold Gouramis in my 10 gallon tank. They seemed to be fine for the first few hours but one of the tetras started nipping at one of my Gourami's fins. The gourami now sits in the corner of my tank behind a fake plant while the tetra waits for it to come out. I tried pushing the tetra away but even after it was gone the gourami stayed there. The Tetra now seems to be leaving the gourami alone but instead it is now being chased by the other gourami (they are about the same size) I did some research and it says that the gouramis can be territorial but i was told differently from the guy at the pet store. I'm thinking about returning one of the gouramis for another fish. Any ideas?