Hello, I own four corydoras, two of them are emerald corydoras and have grown quite a bit. The other two are albinos, one of the albinos has doubled in size while the other albino has shown no growth at all. Some background on the albinos, I rescued them from a bad situation and the one that isn't growing had been bullied in its previous tank resulting in the loss of part of its tail fin. The other corydoras are not chunky so I don't believe that they are female.