I have cleaned the filter - kept up water changes, done everything properly maintenance wise yet my fish hasn't gotten better. He has been like this for about a month now.
He swims to the surface in a seemingly desperate way to breathe and struggles to eat food like he used to - as you can see in the video I put quite a few bloodworms and pellets in the tank so he's got a better chance of eating whatever he can get before he sinks and sits on the bottom of the tank.
Any suggestions are welcome and hopefully he can return to his former glory! I've had him for a year and a half so far.
The only thing that has changed recently is a lack of sunlight since I've moved rooms - will this affect anything?
Just for the record, the stick on leaf has no metal inside, it's just plastic.
EDIT: Forgot to attach video, here it is: http://youtu.be/k3SjWBBRc_k