Thanks for the bump rob..
And i know "Most" piranha are not sexually dimorphic but, i find it hard to believe that a silver fish can go gold.. and i mean extremely gold..(avatar) just by good food. krill has alot to do with my fishes color but there is an extreme difference between the colors of the silver and gold varient.. i have had my brandtii above.. white gravel, black gravel, natural sand, peat fiber, and with plants and his color does not change.. eating strictly live in the beggining he was still GOLD.. now his shade is just much brighter.. like i said this is just a theory.. dont flame me for it..