Angel Fish stuck to filter swimming really weird and fin is broken.. Had been eating off the wall and not food like my other fish? What was wrong with him ?
I'm not sure what was wrong with him. Have you tested the water?
Have you covered the intake of your filter? I would do that as soon as safely possible. Normally I would suggest using pantyhose but in this case filter padding would be the best bet.
You should add something to help with his slimecoat. If you use Prime or StressCoat, those will help with damage to the fish.
Couple of question that will allow for us to help:
Have you tested the water lately? If so, what are the results?
How big is the tank?
What type of filter (and size) do you have?
Any other tank mates?
What do you feed your fish? Flakes? Brand?