in my 20g tank, i have a redtail black shark, 2 female opaline gouramis(for sure f) and 4 platys, the tank has a lot of plants and tubes for hidding. they are all fine with each other except for the fact that one opaline won't stop chasing the other one. i have had the gouramis for about 2 weeks now and they havent seemed to have settled down. the one being chased is barely small than the other, and its colour is lighter blue and its 3 spots are more faded than the bully, which i'm assuming is from the stress. Would it be a good idea to try adding another gourami, male or female? or perhaps to find one of them a better home? (they are both about 4 inches long already, and it would be no problem for me to find another one about their size, maybe not another opaline but a gold one for sure)