I've had my two little swordtail fry in the breeder box for a month now. How do I know when they are ready to be added in the main tank with the rest of my fish? They are probably 3/4 of an inch to an inch long. Probably about the same size as some of my little neon tetras. I'm guessing size wise they are probably going to be ready pretty soon if not now, but I'm mainly worried about them getting food!