Something on Cory cat fin

[DancingBetta]

 

[CassCats]

Looks potentially like a bacterial infection.

Increase water changes to start with to help it heal, and perhaps some antibiotics

 

[Colin_T]

It's excess mucous produced by the fish because something has injured or is irritating that part of the fin.

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

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

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 lawn/ garden.

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

If it's still there after a couple of water changes, add some salt (see directions below).

--------------
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 1 heaped tablespoon per 20 litres 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.

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 2 heaped tablespoons per 20 litres and if there is no improvement after 48 hours, then increase it so there is a total of 4 heaped tablespoons of salt 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.

 

[Anthony1976]

It's excess mucous produced by the fish because something has injured or is irritating that part of the fin.

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

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

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 lawn/ garden.

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

If it's still there after a couple of water changes, add some salt (see directions below).

--------------
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 1 heaped tablespoon per 20 litres 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.

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 2 heaped tablespoons per 20 litres and if there is no improvement after 48 hours, then increase it so there is a total of 4 heaped tablespoons of salt 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.

Is it possible that this is a fatty lump from being fed too much protein rich foods ?

 

[Colin_T]

No

 

[Anthony1976]

No

Hey thanks for the informative response Colin. You may know a lot about fish and I totally respect that and I know that a lot of people on here will back you up but please remember this is a information gathering site at the end of the day. You may be right most of the time but no one is right all the time and your response whiffed of arrogance . A simple explanation of why this wasn’t the case would have been nice so I could have learned also. Tbh I think the fish guru tag has gone to your head a bit . Adios everyone please feel free to delete my account I will go elsewhere to learn about this great hobby.

 

[Colin_T]

I don't always have the energy to write things and lately I am having more trouble doing anything, let alone writing long explanations.

I don't like the fish guru tag and didn't ask for it. I would prefer fish keeper or something like that.

As to why it isn't fat, fish don't store fat in their fins. The fins are basically skin and fin rays and have very few blood vessels in them.

Some fish store a small amount of fat in their muscle tissue but most of the fat is stored in their abdominal cavity separate from their organs.

 

[CassCats]

... @Colin_T simply said no.

ONE WORD.

You projected a lot of attitude onto that simple word lol

 

[DancingBetta]

Who knew so much drama could come from fish fat