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I think my Cory Catfish has Velvet

1) When fish are sick from any disease or water quality issue, they can become lethargic.

2) Clamped fins can be caused by poor water quality or someting in the water irritating the fish, or an external protozoan infection (velvet is an external protozoan), or a bacterial or fungal infection. It's not bacterial or fungal.

3) Fish stop eating when they are sick or if there is a water quality issue. Most fish with velvet will continue to eat.

4)The white film over the body is excess mucous produced by the fish to counter something that is irritating it. This can be caused by poor water quality, something like chemicals/ medication in the water, or external protozoan infections. If the fish has cream, white or grey patches over the body and fins, it is normally an external protozoan infection. If the entire fish is covered in a cream, white or grey film, then it is something in the water.

5) If you photograph a fish using a camera with the flash on, then Velvet will show up as a yellow/ gold sheen over part or all of the body. The pictures do show some gold on the rear part of the fish, which could be velvet.

6) The fish does not have white spot. It does have excess mucous over its body.

7) The white fuzz is excess mucous.

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Vevet can spread slowly and fish might have 1 parasite that can spread over the course of a month before they show any major symptoms.

Fish with Velvet will rub on objects in the tank.
Is the fish rubbing or scratching itsef on things in the tank?

Fish with more advanced stages of velvet will have a yellow/ gold sheen over part or all of their body.

Velvet can be treated with heat (30C/ 86F) for 2-4 weeks, or at least 1 week after all the gold is gone. Or you can use a copper based medication. Do Not use heat and medication because you will probably kill everything in the tank.

Having said this, I would think the fish has other issues and possibly not velvet. It might have velvet but that is not the main issue with the fish. It looks skinny and stressed out. It could have intestinal worms and or gill flukes. And there might be a water quality issue, however the other catfish looks to be in good condition so water quality is unikely to be the cause.

I would deworm the fish and treat them for gill flukes first (Flubendazole does both. Praziquantel will treat tapeworm and gill flukes).
See if you can get the fish to eat. The more food it eats, the more chance it has of fighting off the problem, or at least surviving long enough until we figure out what is wrong. And then maybe add some medication for external protozoan parasites, but that should be a last resort.

See section 3 of the following link for deworming fish.
1) When fish are sick from any disease or water quality issue, they can become lethargic.

2) Clamped fins can be caused by poor water quality or someting in the water irritating the fish, or an external protozoan infection (velvet is an external protozoan), or a bacterial or fungal infection. It's not bacterial or fungal.

3) Fish stop eating when they are sick or if there is a water quality issue. Most fish with velvet will continue to eat.

4)The white film over the body is excess mucous produced by the fish to counter something that is irritating it. This can be caused by poor water quality, something like chemicals/ medication in the water, or external protozoan infections. If the fish has cream, white or grey patches over the body and fins, it is normally an external protozoan infection. If the entire fish is covered in a cream, white or grey film, then it is something in the water.

5) If you photograph a fish using a camera with the flash on, then Velvet will show up as a yellow/ gold sheen over part or all of the body. The pictures do show some gold on the rear part of the fish, which could be velvet.

6) The fish does not have white spot. It does have excess mucous over its body.

7) The white fuzz is excess mucous.

---------------------
Vevet can spread slowly and fish might have 1 parasite that can spread over the course of a month before they show any major symptoms.

Fish with Velvet will rub on objects in the tank.
Is the fish rubbing or scratching itsef on things in the tank?

Fish with more advanced stages of velvet will have a yellow/ gold sheen over part or all of their body.

Velvet can be treated with heat (30C/ 86F) for 2-4 weeks, or at least 1 week after all the gold is gone. Or you can use a copper based medication. Do Not use heat and medication because you will probably kill everything in the tank.

Having said this, I would think the fish has other issues and possibly not velvet. It might have velvet but that is not the main issue with the fish. It looks skinny and stressed out. It could have intestinal worms and or gill flukes. And there might be a water quality issue, however the other catfish looks to be in good condition so water quality is unikely to be the cause.

I would deworm the fish and treat them for gill flukes first (Flubendazole does both. Praziquantel will treat tapeworm and gill flukes).
See if you can get the fish to eat. The more food it eats, the more chance it has of fighting off the problem, or at least surviving long enough until we figure out what is wrong. And then maybe add some medication for external protozoan parasites, but that should be a last resort.

See section 3 of the following link for deworming fish.
Thank you for responding! The one fish ended up passing away a couple days ago in my isolation tank, and his body broke down weirdly quickly, especially considering the only other thing in the tank was some pest pond snails I can’t seem to fully free myself of.

I’ve changed the water from the main tank several times since removing the sick fish, vacuuming where I can, and have been keeping a close eye on them since. I haven’t noticed an abnormal amount of scratching, just one fish rubbing against a leaf every now and then and always a different fish. The weirdest scratch attack I witnessed was In a different tank where three of my female guppies each barreled straight into a Cory catfish that was sleeping on a leaf, one after the other, and the Cory catfish wasn’t phased at all after being pushed around the leaf a little bit and just settled himself back down. It was a very ??? Moment.

I have prazipro to use as a dewormer!
 

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