What did you do for your fish(es)? Did you feed them some special food (maybe live brine shrimp??)? Did you do a nice water change? Buy a new filter? Add some new plants? Give 'em some tank mates?
Today I gave MY Omelette 3 new fake plants. One is like grass in one small bundle, the other is shiny purple with lots and lots of leaves, the last is BIG and is like the purple one, only light green and glow-in-the-dark! I also gave my ghost shrimp who is a tank mate an extra pellet of food as a little reward for staying alive for so long