Clownfish has an injury

[KeiraHachiko]

Hi!
This is my first post and I’m fairly new to the hobby!
I have a 90litre tank with two ocellaris clowns and a lawnmower blenny.
I have come home and found my female to have this injury.
Anyone have any idea what it might be?
Should I treat it? What with?
Based in Australia, my closest options are just pet stores.
Would “Melafix” or “Primafix” work?
Help please!

 

[KeiraHachiko]

Clown is eating, swimming etc fine!

 

[Jekyl]

Welcome to R2R! Other experts will chime in. Having a hard time seeing what you're looking at. Can't tell if it's tank glare or not

 

[KeiraHachiko]

Welcome to R2R! Other experts will chime in. Having a hard time seeing what you're looking at. Can't tell if it's tank glare or not

Sorry I should have been more descriptive! There seems to be an injury on the underside, in the black stripe on the rear of the body. Just down from where the fishes bottom would be

 

[Jekyl]

Late here now. I'm sure most of the experts are sleeping. By tomorrow you will get the help you're looking for. Notice any aggression between the fish?

 

[Jay Hemdal]

Welcome to Reef2Reef!

The location of this injury is important. If it involves the fish’s anus, then internal damage to that area will probably mean that it will eventually die. If the damage doesn’t involve the intestines, then the outcome is more favorable.
In terms of treatment, I’m not sure what drugs you can get. Melafix is more of a tonic and doesn’t work very well for serious bacterial diseases. Can you get ruby reef rally pro? Any true antibiotics?
Jay