Red nose on discus?

Oli

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Noticed these red marks on one of my discus today (the runt of the group)

Anyone have any insight as to what this could be or seen anything like this before?
 

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I've read of this. It's his nostrils that are red. The most common cause when I've seen it discussed is either a bloody nose from an injury /hitting the glass, or a bacterial infection.
As far as treatment goes, I can't help except by bumping your post in the hopes an Australian aquarist will know what treatments might be possible.
 
Sore or wound from a physical injury.

Clean water usually lets it heal without any treatment. You can add salt to help or a broad spectrum medication like Waterlife Myxazin but I would just do a big water change and gravel clean each day for a week and see how it looks in a few days. If it gets worse, post more pictures asap.

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SALT
You can add rock salt (often sold as aquarium salt), swimming pool salt, or any non iodised salt (sodium chloride) to the aquarium at the dose rate of 1 heaped tablespoon per 20 litres (5 gallons) of water. If there is no improvement after 48 hours you can double that dose rate so there is 2 heaped tablespoons of salt per 20 litres.

Keep the salt level like this for 1 week. If there's no improvement after a big water change and a few days with salt, post more pictures.

The salt will not affect the beneficial filter bacteria, fish, plants, shrimp or snails.

After you use salt and the fish have recovered, you do a 10% water change each day for a week using only fresh water that has been dechlorinated. Then do a 20% water change each day for a week. Then you can do bigger water changes after that. This dilutes the salt out of the tank slowly so it doesn't harm the fish.

If you do water changes while using salt, you need to treat the new water with salt before adding it to the tank. This will keep the salt level stable in the tank and minimise stress on the fish.

When you first add salt, add the salt to a small bucket of tank water and dissolve the salt. Then slowly pour the salt water into the tank near the filter outlet. Add the salt over a couple of minutes.
 

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