Why are my fish dying after introducing new fish to my aquarium?

Question

I got 3 zebra danios and 2 leopard danios at petco and in about a day of having them one died. the next day another dies with a strange white spot growing on it. it was not like cotton through which I hear is a disease. my tank is a 20 gallon and before I introduced the new danios I had 3 pearl danios and 2 plecos and the were doing very well and seemed to be in perfect health. well one of my pearl danios died after the new fish came to no obvious elements. and now my 2 plecos died.the same way. Pet's info: Fish | Unknown - Fish | Female | unspayed

Angel Alvarado, LVT · Accepted Answer

Anytime there is an unexpected loss of fish, water chemistry should be checked. Use a home test kit ( https://www.petco.com/shop/en/petcostore/product/api-freshwater-master-test-kit# ) or submit a water sample for testing. Most pet stores will do this for free or for a small fee. Confirm an absence ( 0 ppm ) of ammonia and nitrites with a nitrate level of 20 ppm. pH can range between 6.5 and 8, water temp should be 65 F to 75 F. If chemistry and water quality are within normal parameters, then illness or aggression would be other reasons for the loss. It is always recommended to quarantine fish in a separate tank for 2-4 weeks prior to adding them to the main tank. During this time, they can be treating for infection or parasites. I am sorry for the loss of your fish.

Why are my fish dying after introducing new fish to my aquarium?

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