clownfish disease

[Samw]

Anyone else lose clownfish this month? My brother bought 2 a few weeks ago and he asked me if he could swap 1 of his with 1 of mine so that the new ones can learn to live in his sea anemone. So I agreed. A few days later, his new clownfish dies and the new one in my tank starts to look sick. In addition, both of my original clownfishes from over 2 years ago now look like they both have clownfish disease. I then put the remaining clownfish from my brother's tank back into my tank. There is now 3 clownfishes in my tank. The next day, the 2nd new clownfish dies. So now, I just have my original 2 clownfishes left and both now have clownfish disease. Today, I just have 1 clownfish left and it might not make it through the night. All of my other fish are perfectly fine. I am very surprise as I thought clownfish were hardier than that.