I got two small clowns - black ocellaris clownfish - as my first fish. I have had them a few months and they are beautiful and so friendly. They are inseparable in the tank. I thought one was getting bigger so I named "her" Sarah but now they really look the same size. When will one become female. The one I thought was slightly bigger is a little more aggressive at feeding time but they never fight. They do wiggle and rub across each other frequently and they like to flip their tails in the sand and stir it up and eat what ever floats up so that they have created a big hole.