Why do my cory fish keep dying?

  • Thread starter Thread starter Jaja J
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Jaja J

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I bought 3 new albino cory fish two days ago - 2 are very young while the 1 is about twice their size. After one day, one of the cory fishes died so I got another one. Then another one died and now I have to go get another one.

Why do they keep dying? The older one seems very active (always swimming around, esp near the surface) but the other smaller ones are always laying at the bottom, rarely moving.

I have 3 other fish in the tank - 2 mollys and 1 loach - and they don't seem to bother each other.
20 gallon tank - yoyo loach - pH levels are fine - feed them twice a day with very small tetra flakes - just cleaned the filter and I have a biowheel.
 
what size tank some loaches such as the clown loach get big (around 12"). Have you checked your water quality? How are you acclimating them?
 
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