I have a bit of a problem. My Cardinals are dying one by one.
At first I thought it was my opaline Gourami as I saw him bite the tail of one of them so I got rid of him. Few of them had marks on their tails
I took them out put in a separate tank on Wednesday and treated with malkon but today I lost 4 and yesterday 2 Help. All but 4 are 2 years old.
Does anyone have any answers please.