Thanks for the suggestion. I actually have tried bio-gold, I gave it to my first goldfish for the first 6 months I had them, they grew well on it (doubled in size

), and they were healthy. However I don't feed it exclusively anymore because they also lost a lot of color in those first 6 months. But then when I added progold to thier diet they got a lot of that color back ( and then some

), you're right though it is another good food to vary the diet with, I just wouldn't use it exclusively.