dwarf lionfish RIP

My dwarf lionfish died sometime in the last day or so. I found him missing
today, then found him dead on the floor behind the tank. he either jumped
out or got pulled out by a cat. Yesterday, I think it was, I saw my cat,
which is over fifteen years old, sitting atop my fish tank, looking down
into the water at an open corner near the back of the tank. I chased the cat
off the tank, and didn't think to count my fishes. Now I am thinking I might
have missed a chance to save the fish's life. I cannot believe that a fish
dying could bother me this much. I would rather have lost the cat than the
fish. Mike