Angelfish not eating

[Johnnynunes]

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Tank size: 80gal
pH: 7
ammonia: no test
nitrite: 0,25
nitrate: 40
kH: 4,5
gH: -
tank temp: 26,5c

Fish Symptoms (include full description including lesion, color, location, fish behavior): Introduced last Thursday, never eaten since. Other Angel introduced at same time eating ok. Any tips?

Volume and Frequency of water changes: 10% each day (because of nitrites value) normal 35% twice a week.

Chemical Additives or Media in your tank: Prime on water change. Easycarbo for plants daily

Tank inhabitants: Dwarf Cichlids, Colisa, Neon Tetras and Cherry Barbs

Recent additions to your tank (living or decoration): Angels (these 2)

Exposure to chemicals: nothing

Digital photo (include if possible):
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[Goosegrl2019]

Have u tried brine shrimp?? Irresistible to fish. Not sure what ur feeding.

 

[Munroco]

I'd agree with trying live food. Is the other angel bullying him/her (I'd guess a him) maybe?

 

[Colin_T]

Volume and Frequency of water changes: 10% each day (because of nitrites value) normal 35% twice a week.

10% water changes don't do anything to dilute things in the water. If you have an ammonia or nitrite reading above 0, or a nitrate reading above 20ppm, do a 75% water change and gravel clean the substrate every day until the levels are back to 0.

Then do a 75% water change and gravel clean the substrate once a week.

If you only do a 10% water change, you leave 90% of the bad stuff behind.
If you do a 50% water change you leave 50% of the bad stuff behind.
If you do a 75% water change you leave 25% of the bad stuff behind.

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Stop adding plant fertilisers for a few weeks.

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The fish has an infection in the mouth or gills. You can try adding salt and see if that helps. If there is no improvement after a couple of days with salt then get a broad spectrum fish medication that treats fungus, bacterial and protozoan infections and treat the tank. But try salt first.​

You can add rock salt (often sold as aquarium salt), sea salt or swimming pool salt to the aquarium at the dose rate of 2 heaped tablespoon per 20 litres of water.

Keep the salt level like this for at least 2 weeks but no longer than 4 weeks otherwise kidney damage can occur. Kidney damage is more likely to occur in fish from soft water (tetras, Corydoras, angelfish, gouramis, loaches) that are exposed to high levels of salt for an extended period of time, and is not an issue with livebearers, rainbowfish or other salt tolerant species.

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

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.