We have two giant gouramys,one is a pinkish color(8 inches) the other is grey(6 inches) with faint stripes and has a dark circle near the tail.They do not get along at all.Yesterday we noticed that the grey one has a sharp row of teeth????Do they all have these teeth because we cant really see any teeth on the pink one??Would this be the reason they do not get along?Maybe we got lucky and got one of those toothy kind of gouramis?I'm going to try and get pictures of his fangs.