I've heard that breeding different lines will lessen the effect, but I don't know if this is fact or rumor. I've seen some individuals that didn't have as pronounced of a duckbill as others and those have been from different lines, so I think it'll have to be something that's line bred out. Personally I don't worry about the duck bills myself, I don't think it detracts from the looks all that much. What I worry about is that the supers also show a propensity for occaisional kinking.