There may still be one or two that are well hidden. I didn't see my first survivor fry until it was about 3 weeks old, so don't despair. Even if (big if) they have all gone this time, you can bet your bottom dollar they'll be having more in 4-5 weeks as they can produce fry up to 6 times on a single mating. Consider letting them have the fry in the main tank next time. You've got the stress coat to calm them if you think they are being harrassed and you may lose a few fry to voracious adults. However if you have a few live plants for them to hide in and feed off, a good proportion of them will survive and you'll be wondering where you are going to put them all!