Every now and then there's an egg that hatches and I'll have forgotten to pristmatic philter at the time or it came out super nice and I'll wish I had. I was thinking what if there was a fee for being able to apply a philter right after for either diamonds or gold. Perhaps the fee can even start very low if it's say within 15 minutes of the egg hatching and become more expensive at like an hour later, 3 hours later, 12 hours later, and stop being available as an option after a day or something later.