My betta fish Duke has been acting really bizarre and unwell for the past few days. Prior to leaving for vacation he had been acting pretty normal, but my dad was looking after him while I was gone - in my house, so he wasn't moved or anything. Then my dad said he started acting weird - not eating much, not swimming much. He is in a 2.5 gallon betta bow with a minibow filter. I keep the tank between 24 and 27 degrees celsius.
Now for the past few days he has either been hiding by the filter and a fake plant at the very top or sitting on the bottom of his tank/hiding in a ship. He's very lethargic not moving at all when I come to see him, which is abnormal. He's not eating and I can't tell if he's pooped or not - I see one poop in the tank. I did a half water change and cleaned the gravel two days ago.
I tried putting in Betta Revive yesterday, hasn't done anything yet. I've also put in some Betta Fix which hasn't helped much either.
Please help me!!! I've only had Duke for about a year, so I don't think it's his time to go yet.