If you have a fair few plants, then some fry should survive. Around a year ago, I was just giving my fish their twice-weekly frozen Daphnia when something caught my eye, right at the top of the waterline. It was a single fry. I'd long since traded in the last of my Livebearers and hadn't seen any eggs ANYWHERE in the tank when doing maintenance. I popped it into a breeding net in the tank and a couple of weeks later found it to be a Dwarf Neon Rainbow fry. I can only think it had VERY good hiding skills. Still got it now - I just couldn't bring myself to part with her, not after surviving that long.