Fish with a fin issue

Dbrs4me

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Hey guys, I have a Boesmani rainbow fish that has a weird side fin. It looks like it’s decaying or something I’m looking for some advice on what I can do to help it out. I have attached some photos.
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Looking for advice. Thanks.
 
That is fin rot disease. How annoying.
Fin Rot can be the result of a bacterial infection (Pseudomonas fluorescens, which causes a ragged rotting of the fin), or as a fungal infection (which rots the fin more evenly and is more likely to produce a white "edge"). Sometimes, both types of infection are seen together.
To heal the fish, add 1 tsp per gallon of aquarium salt to the water. Remember to pre-mix the salt in the water before adding it to the aquarium. It's a good idea to place the betta in the body of water after it's medicated with salt. Do a 90% water change everyday.
Hope this helped! ;) Good luck with your rainbow fish!!!
 
That is fin rot disease. How annoying.
Fin Rot can be the result of a bacterial infection (Pseudomonas fluorescens, which causes a ragged rotting of the fin), or as a fungal infection (which rots the fin more evenly and is more likely to produce a white "edge"). Sometimes, both types of infection are seen together.
To heal the fish, add 1 tsp per gallon of aquarium salt to the water. Remember to pre-mix the salt in the water before adding it to the aquarium. It's a good idea to place the betta in the body of water after it's medicated with salt. Do a 90% water change everyday.
Hope this helped! ;) Good luck with your rainbow fish!!!
The betta?
 
It’s in a 75 gallon tank with many other fish. Does that change the plan? I don’t have a quarantine tank.
 
It doesn't look like fin rot to me. @Colin_T might be able to help
 
The fish has clamped fins and excess mucous on its pectoral fin.

Check the water quality for ammonia, nitrite, nitrate and pH.

Wipe the inside of the glass with a clean fish sponge.

Do a 75% water change and gravel clean the substrate.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

Clean the filter if it hasn't been done in the last 2 weeks. Wash filter media/ materials in a bucket of tank water and re-use the media. Tip the bucket of dirty water on the garden/ lawn.

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Add salt.
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.

If you only have livebearers (guppies, platies, swordtails, mollies), goldfish or rainbowfish in the tank you can double that dose rate, so you would add 4 heaped tablespoons per 20 litres.

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 but the higher dose rate (4 heaped tablespoons per 20 litres) will affect some plants and some snails. The lower dose rate will not affect 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.
 

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