I have 2 clown loaches, who are perfectly content being a duo, they were both the same size when I bought them a few months ago, only difference was their coloring, one being bright orange with grayish stripes, the other lighter with blackest black stripes,but now the orangiest one has doubled in size, he's clearly at least 4 inches compared to the other one who remains 2ish or so, what gives? Is it because the oranger one hogs all the food? the other one certainly gets its fair share though so I'm not sure, the larger one seems to be waaay more territorial then the other ,turning pale anytime I change something in the tank or if he has something really good to eat and doesn't want to share, is it the sex of them, how can you tell a loaches sex?