What happend?

[Minedweller]

I have two corys that I think were attacked in my tank all the fins are gone, I am thinking that one of my Raphaels got them they seem to be getting buy ok just swim a little different...

[annageckos]

Wow, that looks really bad. Though it almost looks too 'smooth', I guess is the right word, for another fish attack. Could be though. What size tank are these guys in? Parameters? It almost reminds me of bacterial/fungal.

[VoidParadigm]

Ouch. Could be some form of finrot... Was this gradual or overnight?

No matter what it is it will be hard to treat it, as cories are sensitive to many medications.

[Lab_Rat]

Agree that the fins are too evenly gone for another fish attack. I would think severe fin rot or other nasty infection. The barbels look ok, they're usually the first to erode. What are your ammonia, nitrite, and nitrate and your water change schedule?

[annageckos]

Water changes, lots of water changes. You need to keep that water very clean to help them heal.

[Minedweller]

Its a 55gal, no other fish have any problems and I have two other corys with no defects

[annageckos]

Do you know what the parameters are in your tank?

[Northernguy]

Poor thing does look rough.I can't see it lasting long enough to heal.
Hopefully it does.
Can you test your tank and post some numbers.
It does kinda look like it got beat up.

[Minedweller]

Two of them have been like this for over a year and gets around fine just thought maybe it was one of my other fish since my third cory was not affected.. but back then I was not the best person to own a tank it was just recently I got my head out my but and started to care.. I am really getting into my tank and starting to enjoy it so I want to make sure I am doing the best I can to give them a good home.. I will have my water tested at my local pet shop tomorrow and see where I am at.....

[Lab_Rat]

I'd recommend picking up liquid test kits for at least ammonia, nitrite, and nitrate as any time you have an issue people will ask for these readings. They can help you know what is going on in your tank.

If they've been like that over a year then it's not an acute concern. Just keep up on your tank maintenance, keeping nitrates less than 20 ppm or so for optimal conditions.

[Minedweller]

I will do that thanks