Feel the satisfaction of owning a large tropical fish without the need for a large heated fish tank simply submerge this egg in water and wait for the magic to happen after twelve hours or so the shell will begin to crack and after 48 hours a baby clown fish will hatch and start pushing its way through the shell leave your fish in water for a full week and it will mature to its full size it39s the perfect way to raise a tropical fish without the worry of wondering who will feed it when