Thank you for all your condolences and advice. I did feed them with garlic, but every few days one of them died and just getting worse and worse. They eat normally in the day time, but at night they became covered with white and getting weaker day by day. I had raised the temperature to 81F day and night but it still didn't help at all. The total of 15 fish died with opened gills and mouths, looked very suffering. At the beginning when I had a few fish die, my husband had spoke to Jeff from J&L and had someone there test the water for me, the water was fine. He told my husband don't do anything when we thought we might need to put an extra powerhead if there is some lack of oxygen in the tank. At that time, the fish didn't show any ich, they just died with no reason. A week later they became all covered with ich.
I am devastated with the loss. Some of the fish I had were more than 8 years with me. I felt completely useless seing them die. It is a great sadness for me.
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