How do I know if my pet fish are happy?

John

New member
I have some pet discus fish, i feed them every day and clean the water every month and i want to how i can tell if they are happy or not. Also does it matter what kind of fish type you have to tell if they are happy or sad.
 
Equate happy to mean healthy when it comes to fish.

I suggest a partial water change of roughly 25% every week. Monthly changes are letting the tank go too long.
 
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