So I returned to the LFS
where I bought the fish and headed right for the tank it came from and lo and behold there is another clown fish rolling on the bottom tank, obviously distressed, acting almost identically to mine just before he died. As if that wasn't bad enough, 2 other clown fish were charging and ramming it.
I think I failed to mentioned that fact earlier; as that was the reason I selected the fish I brought home. It appeared healthy at the time but appeared to be getting ganged up on which I thought was simply because he was smaller. Did the other clowns know he was sick?
My water quality continues to be really good. Are there any dangers aside from what a good test kit will monitor for?