Glofish sick

I just noticed this fish today. Its in a 55 gallon community tank. No other fish are sick. Could this be from nipping or is this a disease?

The fish is covered in excess mucous (cream film over its body and fins).

The fish has a wound on its belly that could have been from a bite but it looks infected and will need something to treat bacterial infections.

The fish's fins are chewed up and that is probably from other fish biting it.

The fish looks skinny.

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You can try a broad spectrum medication that treats fungus and bacteria, or just euthanise the fish.