ok i just had one hatch and i'm in the process of getting rid of it for the reason as i was getting a big tank from a friend and it broke soooo now i have to sell him. i had the egg for like almost 2 months before it hatched and if you put the egg up to a light in your tank...do not take it out of the water it will fill up with air... you can tell because the egg yolk stuck to the shark will be pretty much gone and the shark will look soooo squished in the egg. also the egg should shake from time to time.