Cory missing pectoral fins


Well Known
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North Carolina
1 year

What is the water volume of the tank? 29 gallons
How long has the tank been running? 8 months
Does it have a filter? yes
Does it have a heater? yes
What is the water temperature? 78 degrees fahrenheit
What is the entire stocking of this tank? (Please list all fish and inverts.)
How often do you change the water? once a week
How much of the water do you change? 25%
What do you use to treat your water? Api stress coat
Do you vacuum the substrate or just the water? substrate

*Parameters - Very Important
Did you cycle your tank before adding fish? yes
What do you use to test the water? tetra 6 in 1 test strips
What are your parameters? We need to know the exact numbers, not just “fine” or “safe”.

Ammonia: 0
Nitrite: 0
Nitrate: 20
pH: 6.5

How often do you feed your fish? once a day
How much do you feed your fish? a pinch of flakes and 8 sinking pellets
What brand of food do you feed your fish? omega one and hikari
Do you feed frozen or freeze-dried foods? yes

Illness & Symptoms
How long have you had this fish? 4 months
How long ago did you first notice these symptoms? a few days ago
In a few words, can you explain the symptoms? cory is missing a pair of barbels and his pectoral fins
Have you started any treatment for the illness? no
Was your fish physically ill or injured upon purchase? I bred this fish, I don’t know
How has its behavior and appearance changed, if at all? He is acting normal

Explain your emergency situation in detail. (Please give a clear explanation of what is going on, include details from the beginning of the illness leading up to now) I have a pair of corys that had babies in December and I noticed today that I think the offspring have a lot of birth defects. I kept 7 of the fry so I don’t know about the other ones that I’ve already sold but so far 3 of the corys are missing a pair of barbels and one of those also is completely missing his pectoral fins. I would just like to know if there’s anything I can do to help him, because he doesn’t seem very bothered by it and can swim pretty well, is eating and is acting overall normal.


Well Known
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Northeast Ohio
More than 10 years
If he's acting fine, then just let him be. They don't really use their pectoral fins for swimming so it shouldn't affect him much.


Well Known
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Just started
If this is the first time these corys have bred, I'm thinking they just "messed up". I've read a lot about how the first batch of eggs typically just doesn't work til the parents get it right. Maybe that happened here? Like said above, if they're acting fine and able to eat then I'd leave em alone.

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