I have had 3 otto's in my tank for about 2 months now and they all seem to be quite healthy. They were all the same size when i got them (roughly about 1" long), but now one of them is about 2" long and really fat and wide, where as the other 2 don't seem to have grown at all. Is it possible i've got 2 males and a female (who's full of eggs), or do male and femail otto's just differ in size that much, or is there just some other problem with the really fat otto. 
