Sorry to hear about your fry. I found myself in the same situation you are in. I had about 2 dozen fry to start and most of them died within a couple of months. I had 2 that lasted much longer even though one of them was tiny compared to the other. Finally Squirt passed away (abnormal mouth and gill development) but I'm happy to say his sibling is still going strong 10 months later!!
Good luck with your fry! I hope at least one of them makes it!