One of my Guppies just passed away from swim bladder disease, or so it may seem. It was constipated for about two hours. I feed my Platies and Guppies goldfish flakes, because I used to have goldfish and never got rid of the flakes. Could I keep giving them the goldfish flakes until the container is empty? Or should I just go and get them tropical flakes? I also feed them bloodworms as treats.