Weird white spot on rainbowshark.

I recently noticed a white spot on my rainbow shark’s head and don’t know what it is. Please help identify the problem so that I can treat it.

Can you clean the glass and post a couple more pictures of it
How long has it had the white patch

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FIRST AID FOR FISH
Wipe the inside of the glass down with a clean fish sponge. This removes the biofilm on the glass and the biofilm will contain lots of harmful bacteria, fungus, protozoans and various other microscopic life forms.

Do a 75% water change and gravel clean the substrate every day for a week or until the problem is identified. The water changes and gravel cleaning will reduce the number of disease organisms in the water and provide a cleaner environment for the fish to recover in. It also removes a lot of the gunk and this means any medication can work on treating the fish instead of being wasted killing the pathogens in the gunk.
Make sure any new water is free of chlorine/ chloramine before it is added to the tank.

Clean the filter if it hasn't been done in the last 2 weeks. However, if the filter is less than 6 weeks old, do not clean it. Wash the filter materials/ media in a bucket of tank water and re-use the media. Tip the bucket of dirty water on the garden/ lawn. Cleaning the filter means less gunk and cleaner water with fewer pathogens so any medication (if needed) will work more effectively on the fish.

Increase surface turbulence/ aeration to maximise the dissolved oxygen in the water.

The reason for the dirty water is that I just changed the scape of the tank and the filter hasn’t cleared up the water yet. The scape change didn’t mess with the rainbow shark the only real change was the addition of more terrestrial plants. I think the main cause for the spot was a fight between the rainbow shark and a Siamese algae eater when they first met each other. They both stopped fighting and went on with their normal behavior after the initial fight, and the spot appeared directly after the fight.

The spot has been around for some days. I tried the microbe lift herbtana expellant for parasitic diseases but had no success.

My guess would be some sort of fungus, but I don’t know much about the fungal diseases of fish.

It's more likely to be a bacterial infection than fungal, and it seems to be eating away at the tissue if there's a hole in the middle of the white gunk.

You need something that treats bacteria and you need to clean the tank up so any medication works quickly and effectively.

If you have carbon in the filter, this will need to be removed when you treat the fish so it doesn't remove the medication.

Thanks I’ll look for a bacteria treating medication and turn off the filter that has carbon in it.

Keep the filter running, just remove the carbon.

The carbon can either be kept wet and put back in the filter after treatment has finished. Or throw the carbon away and replace it with a sponge.

Okay. I do have two hang on back filters on the tank and only one has carbon.