My betta has red fin tips and corydoras have red spots. What's wrong?

Question

My betta has red tips on his tail and my cat fish Cory has red spots as well. Pet's info: Fish | Unknown - Fish

Angel Alvarado, LVT · Accepted Answer

This could be bacterial infection. Most minor infection can be managed or resolved by providing pristine water conditions and a tiny bit of plain aquarium salt (NOT table or Epsom salt). Perform daily partial water changes, about 30%, using aged or conditioned water that is temperature matched to prevent further stress or shock. Dissolve about 1/2 teaspoon of plain aquarium salt per gallon of water into the tank. Treat for 10-14 days then reassess their condition. If necessary a broad spectrum antibiotic can be found in the aquarium section of the local Petco. Follow label directions carefully. As an aside, Bettas do best between 78F and 80F. Cory cats prefer cooler temps, between 60F and 75F. They do not do well at temps that Bettas are kept in, eventually they will become stressed which can lead to infection. Consider separating one or the other into a tank with the appropriate water parameters.

My betta has red fin tips and corydoras have red spots. What's wrong?

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