How long have you had him, how big is the tank, how much and how often on the water changes, filtration, live plants, water temp, additives used if any, any medication or treatment tried and has he ever been sick before now-how long has he been acting this way and any other symptoms other than hiding and not eating?
I have had him about half a year now.
The tank is an Aqueon 2.5 gallon.
I always do %100 water change every 2-3 weeks.
I do have a filter & heater.
I have not used any medication, only water conditioner from his last water change a few minutes ago.
He has never truly been sick before. Close calls, but not like this.
He has been acting this way/not eating for 3-4 days.
I noticed he was breathing EXTREMELY hard. Almost like a wave from his gills to his little "lungs."
BTW I'm snowed in so I cannot get fish supplies from the store.
He has also started moving more now.