Sudden death- Coincidence?

CoryCatfish

AC Members
Jun 11, 2012
16
0
0
Florida
Real Name
Tanya
In the past three days, 3 fish have died. I'll tell you how it happened, but I'm not sure what to do.

Day 1:
A new blue angel about 2 inches in body died. My younger sister saw him leaning against a wooden decoration. He was dead. When we removed him, he had a wound where he was attached to the decoration.

Day 2:
No casualties, but some important events occurred. We got new lights for our tank eventually, after about a year with a bad ballast box that kept the aquarium under perpetual darkness. We did a water change, and used the water to clean the filter.

Day 3:
My mom woke up at 5:30 am to feed the fish before going to work. She found a dead small angelfish.
Around 12, I had noticed that our largest angel (full size black marble) was swimming oddly. I thought he was just disoriented with the light. At 2:22, I noticed that he was not moving. He was upside down and breathing slowly, almost once every ten seconds. I saw a wound on his side. I removed him, hoping that ammonia levels would stay normal.

The tank is 33 gallons. It had:
2 small angelfish (relatively new)
1 medium angelfish (relatively new)
1 large angelfish (been with us for 2 years)
1 large clown loach (3 years)
2 small loaches (new)
1 small cory (a long time, his group died off with age)
1 leopard ctenopoma (new)
3 skirttail veil tetras (3 years)
1 siamese algae eater (new)

pH: 6.8
Ammonia levels: 0.25 ppm
Tank not planted
Decorations: One large rock with holes, one large driftwood, small scattered rocks.
Temperature: 79-80
Lights: Coralife Compact Fluorescent Lunar Aqualight, 30"
Settings: Daylight: 10000K from 8 am to 8pm, with a break from 12 to one to discourage algae
Actinic: 6am to 10 am, 6pm to 10pm
Night LEDs: 10 pm to 6 am

Relations were pretty good. The only ones that really fought were one of the small angels, which would harrass the medium one. I was thinking maybe that the small one chased the medium one onto the driftwood...
The leopard ctenopoma didn't like the small angelfish, and would chase them if they got close.
Otherwise, everything was good.

If anyone knows anything that I could do, or that I did wrong, I would be eternally grateful. Please....D;
 
My best guess, it is the larger angel. A 33 is small for angels, and they do protect their territory.
 
The larger angel was territorial to the smaller ones for a few days, but then stopped. He did die himself on Day 3.... By far, the most violent fish we have is the Leopard Ctenopoma, and it is under an inch and only fights with the remaining small angel. (It never fought with anyone else).
 
That stocking does seem pretty tight (I wont go overstock police-mode...yet) so any natural aggression or territorial tendencies can certainly become amplified in close quarters. Keep in mind that you may not always see the behavior for it to be happening and stressing the victims.

What test kit are you using? Have you checked nitrite/nitrate?

Any detectable ammonia level should set off a red flag. What is your normal maintenance routine?
 
That stocking does seem pretty tight (I wont go overstock police-mode...yet) so any natural aggression or territorial tendencies can certainly become amplified in close quarters. Keep in mind that you may not always see the behavior for it to be happening and stressing the victims.

What test kit are you using? Have you checked nitrite/nitrate?

Any detectable ammonia level should set off a red flag. What is your normal maintenance routine?

Pretty light? With that many angels? Angels are territorial at almost all ages. My guess would be that the largest angel did the most damage, and that the clown loaches played a part as well. They are certainly not aggressive, but have been known to harass other fish.


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I was trying to be as gentle as possible at this point in time. I definitely do not think that stock will last for long, especially given the adult length of a lot of those fish.

Definitely understand, but the deaths may actually be a result of the overstocking...fish in general get more aggressive when they are overcrowded. Fish that are territorial to begin with, like angels, will only get worse.


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Don't count out the leopard either....just because he is small. They are extremely predatory. But, sounds like you added new fish over the course of however long. You shook up the pecking order repeatedly....who knows. But does sound like aggression most likely.
 
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