Marine Velvet, I can't believe its happening to me.

[MKLKT]

I suffered the same fate as Aquattro about the same time earlier this year. I lost about half my fish. I did a 1 month course Metronidazole/Focus and garlic drops, the remaining fish stabilized although it's tough to give the efficacy. My foxface had clouded eyes (and was blind on one side), dots all over and was listing a bit and has now made a full recovery.

I suspected a sudden drop in temperature at the time is what caused the stress as I hadn't added any fish in many months.

I left the livestock alone for about 3 months before I added anything new; since then it's been another 3 now and have no further issues.

The symptoms of each fish were kinda different so a true diagnosis is tough, all I know is that I feel your pain. It really sucks, the whole family was pretty glum here, too.