Who is the corydoras killer?

[Fishobsessed7]

Water parameters:
Ammo 0
Trites 0
Trates 5-15

Today I found one of my peppered cories dead. A few hours later I found one dying. Last week I found one stuck to the intake, and the next day another one. I haven't noticed anyone aggressive besides the Plecos, but only to each other. It can't be the Angels because they were added on Saturday. The 8 cories is how many I had last night. There is six now.

NOTE: I'm waiting for the Angels and Rams to pair off. The extras will be moved. The mollies will be moved in about a month or so.


Fishobsessed7

3 tanks and counting! (6 if you count the bettas)

 

[PassengerTN]

Not a clue but its interesting! My Tinfoil Barb ate mine -_-

 

[coralbandit]

What's your hardness and what state are you in?
Cories can have a real hard time with high gh and sodium.

 

[Delapool]

Nothing really pops up there on the list. What symptoms are you seeing when they pass on?

 

[Finntastic]

Do the cories have any injuries on them?

 

[Fishobsessed7]

They will be swimming and acting normal, then they are just dead.


Fishobsessed7

3 tanks and counting! (6 if you count the bettas)

 

[Fishobsessed7]

Ive never had problems with cories previously.


Fishobsessed7

3 tanks and counting! (6 if you count the bettas)

 

[Finntastic]

My guess is disease. I've had something similar to your description with a school of saltwater fish. It seemed like every day I would find a fish that had been blue/green a few hours earlier and than become grey/black/white stuck to the power head my school of 8 is now down to 1 who is fine so far.


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[Catfish Lover]

Maybe disease but bristlenose plecos can be nasty at feeding time. My peppered corys are constantly having specs of blood on their bodies from the plecos throwing their bodies around.


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[FWFishTanks]

Possibly disease, but it might be aggressive if the fish had any obvious marks. I had an aggressive angel take out a few of my juliees. That may be the case with one or more of your 6

 

[Fishobsessed7]

Possibly disease, but it might be aggressive if the fish had any obvious marks. I had an aggressive angel take out a few of my juliees. That may be the case with one or more of your 6

It can't be the Angels because they are new and don't hardly go down to the bottom.


Fishobsessed7

3 tanks and counting! (6 if you count the bettas)

 

[keegster803]

Maybe it could be the 5 rams, they can get pretty aggressive at times


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[Fishobsessed7]

Maybe it could be the 5 rams, they can get pretty aggressive at times


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The Rams are actually not aggressive at all. The most aggressive thing that I've seen them do is lip-lock with each other for a few seconds. They actually get pushed around by the other fish during feeding. I'm thinking it is most likely the Plecos if it's a fish.


Fishobsessed7

3 tanks and counting! (6 if you count the bettas)

 

[Pseudomugil]

It could be the substrate. I had the wrong substrate with cories and I couldn't figure out why they kept dying. They find food using their barbels and if the substrate hurts their barbels they can't eat.

What is your substrate?

 

[Fishobsessed7]

The substrate is the black sand at petco.


Fishobsessed7

3 tanks and counting! (6 if you count the bettas)