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What's happening with my cory?
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keithkyli
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Joined: 27 Apr 2010

PostPosted: 2012.05.17(Thu)2:44    Post subject: What's happening with my cory? Reply with quote

One of my 3 peppered corys got a problem. Let me use point form. And it still seems overwhelmingly long. Shocked

1. There is a hole/lesion (~1mm) on her left "clavicle" that has been persisting for months.
2. She showed no interest when the other corys were spawning a few months ago. She turned away when the male tried to impress her.
3. She has been surfacing to breathe more often for the past 2 weeks or so.
4. Her left pectoral fin is damaged and doesn't seem to grow back for 1 week. I don't know whether it was caused by a disease or aggression from breeding angels. I saw my male angel attack this cory, but I am not sure did that result in a broken fin.
5. There is a brown red spot (~3mm) on her belly near the damaged fin which I noticed just yesterday.

Things happened in that order.

The fish has a normal appetite and can swim normally. The only behavioral anomaly is she surfaces to breathe more frequently. The barbels are present but seem to be a bit shorter. I don't know whether it's inborn or caused by damage.

The fish keeps moving and my camera is not that good, so I've used a pic from wikipedia to illustrate the symptoms:
http://i952.photobucket.com/albums/ae3/keithkyli/Aquarium/Corylabel.png

As for water parameter:
- The tank is 30 litres and I admit it is overstocked (corys 1M2F; angels 1M1F; guppies 2M5F; bentosi tetras x3). The corys are the toughest fish I've ever had. I try to make up for the little room by making good use of plants, filter and water changes.
- The tank has been set up for 2 years following a catastrophe. The cory concerned survived that event and displayed none of the mentioned symptoms back then.
- I change 30% water every week.
- I don't have a nitrate test kit.
- pH = 7 and constant.
- Temp: 26-28C in summer, for winter used thermostat set at 25C.
- Filter comes with the tank (across the top) and I put sponge pads and bio-rings in it. The sponge pads are mildly washed every 2-3 weeks and changed every 2-3 months. The bio-rings are not bothered.
- There is a 1-foot wide Echinorus uruguayensis, about 10 corkscrew vals, and some Anacharis/Elodea. All plants are growing well.
- Other fish show no sickness at all.

I have tried to search, but it doesn't seem like fish TB or septicaemia. I've tried my best to provide as much detail as possible. All comments are welcome. Thanks.
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Diamond Hill, Hong Kong
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diademhill
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Joined: 18 Apr 2007

PostPosted: 2012.05.17(Thu)4:37    Post subject: Reply with quote

Damage & bruising and not healing due to poor water conditions.

You have enough fish for a 150 litre tank so should be changing the amount of water that you would for a tank that size - 50 litres per week - or sort out your stocking.
I vote for sorting out the stocking as you can't keep those fish well in a tiny tank.
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