On a rewatch. Interested in people's thoughts or theories on this -

Alan's fish disappears just before he goes to Nadia's party for the first time. "Welcome to yesterday!" (Also, I have a separate theory on why Oatmeal disappeared earlier on than fishy, but that's not the point now.)

Then the "bike accident"/gas explosion

Getting hit by a car (oh, classic)/gas explosion...again

And mace-induced asthma attack/Nadia being shot

Since Alan is a pretty compulsive individual with his routines, and in Ep 4 he's shown feeding fishy before he leaves for Bea's and then in the morning. Twice a day. How does he not notice fishy missing until 3 deaths later?

Cheers.