20 Gallon Tank Mysterious Cory Death

Aquariumstand1234

Hello, we’re hoping someone will be able to help us identify what happened to our Pygmy corydora.

For context, we recently got 4 Pygmy corydoras and quarantined them for around 2 weeks in a 6 gallon tank with no other fish (only snails). Last week, we added them to our 20 gallon tank (where 2 Pygmy Corys have been living in for a few weeks), which has the following parameters and bio load:

0.0 Ammonia
0.0 Nitrite
5.0 Nitrates
7.6 -8.0 pH (honestly, it fluctuates quite a bit.)

5 Pygmy corydoras
6 celestial pearl danios
6 rummy nose tetras

Since added, the tank seemed fine, until today we noticed one cory was belly up at the bottom of the front of the tank.

All of the other fish are accounted for and seem fine, so we’re not sure if this is due to disease or because of an attack. The alpha male CPD does chase and can be aggressive, but has been peacefully coexisting with the tetras and other pygmy corys so we’re not sure.

I’ve attached some photos so hopefully someone can help me identify the problem. We’re so sad to see this but we want to make sure our other fish won’t be affected.

Any help would be greatly appreciated!
 

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Yeoy

If there is no obvious injuries my first guess would be that it was just stress from the move/acclimation. Pygmy corys can often suffer that and some of the stock is still wild-caught in some areas I think. I'd just keep an eye out for any aggression from your other fish.
 
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