Clown fish issue

[Netjumpr]

I need help. In last 3 days I have lost 2 clown fish. I have no idea what problem is. My water parameters are the same they have been for past 4 months. Ammonia is fine . I did just dose with Stability. Strong water flow. They have been living in a long tentacle anemone with no issues. When I lost first clown I thought it was a arrow crab I had in tank so I isolated him in another tank. My tank is 75 gal. I did replace the first clown with another of same size and same kind.
Any suggestions??