Are Corys Super Sensitive To Nitrates?


HI all. I'm reaching out to the corycat. experts out there. I have a 75 gallon that's been established for about a year and a half. I've got
7 turquoise rainbowfish
2 Bolivian Rams
11 harlequin rasbora's
2 sunset dalmation Molly's
6 trilineatus corys
6 bronze cories
My water parameters are 0/0/20-40. Temp is 75.5 F.
I do 30-50% pwc every one to two weeks. And, I just keep losing my trilineatus here and there. I'm wondering if they are just extra sensitive to the nitrates. Or is the temp possibly the problem?


HI Conniem!
I haven't noticed a high sensitivity to nitrates in my cories. But tbh, I nearly have none of nitrates at all in my aquarium ^-^
Well I have albino Cories and I noticed that they are very sensitive to to much light and stress in general. Don't worry they're all alive and healthy but due to the said reasons/problems, they can act really apathetic or even seem to be dead. I enlarged the dark-time of my aquarium and I didnt noticed this strange behaviour anymore


If all your other fish are ok, it just might be bad breeding stock or old age (though they do live 8-10 yrs). 20-40 nitrates is almost pristine water.


Make sure they have hiding spots away from the light. I have 5 pandas in my 26 and provide plenty of spaces for them to be when my lights are out. They are far more active once the lights are out.

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