Lost 2 Fish in 2 Days ??????????

[Black Phantom]

I'm at work so I will have to check the water when I get home. The fact that all other animals in my system are doing just fine is strange.
When a fish passes away from old age what signs do they show?
Both of these fish looked ok two days ago and I know that both of them have been eating as they were both fat and sassy.
If my water parameters had strayed then I'm sure some of my more delicate corals would be showing stress and they are all good.
I certainly agree with Iron Chef. No healthy fish would get stuck to a pump.
It really sucks to lose two nice fish at the same time. Especially as they were both the first inhabitants when I set up this tank 5 years ago.