whats the differences between a short body and a fat endli? the fish in pictures 1, 2, 4, are the same age, and the congicus in picture 3 and 4 are the same length(13"), but the fat one is twice the girth- also his head is gigantic in width, but very low and flat in height- how would I judge the spoonheadedness of it? is there a standard or something? thanks all-