Hi val,
I wouldn't worry about the color too much at this stage, the fry look very healthy and happy. You will find over the coming weeks there will significent changes to the way they look. The white body color is actually base color rather than pattern color, the redish color you are noticing in the fins will gradually spread through the body. Normally from about 4 weeks pattern will start to develop, generally in the fins and head first and gradually through the body (depending on strain). Some strains take 12 months or so before full color and pattern is finalized. Well done with these fry, they really do look good.
Rod