Ocellaris clownfish hasn't eaten for 2 weeks, lethargic
This is my first post in this forum so please excuse me if I don't explain this situation well. Also, I'm from Japan so my english might not be perfectly understandable.
My husband and I have had our ocellaris clownfish for more than three years now, and she stopped eating about 3 weeks ago. She's pretty small, about 3.5 centimeters. Her tank is about 70L. Only tank mate is peppermint shrimp. Water condition is excellent. We do regular water changes.
We are not amatures but we aren't experts either. Our fish has been a very aggressive eater the whole 3 years that we have had her. She doesn't have any sign of disease right now except for the lethargy, no appetite, faded color.
We have tried to feed her everything available. Literally everything. She swims up to it and then swims away. Most of the time she just sits at the bottom of the tank in one place.
We love her as much as anybody would love their dog or cat or perhaps even more. We really need some ideas as to what could be the problem. I have to avoid looking at her these days because seeing her like this makes me cry everytime. What could be the disease or problem? Please help.