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Marc getting home, tired as all hell, wanting just to lay down and let Steven take over for a bit, walking into his flat and thinking "hmmm... I may be forgetting something" then looks over and Gus The Fish Is Fucking DEAD and has a panic attack trying to figure out how the fuck he's supposed to replace this fish before Steven sees him and has another breakdown because he doesn't need that right now; he already made him miss a date, he threw him into a stressful situation without first making himself known, he has so much going on, he doesn't need his fish dying too :'(
So he's calling and visiting every pet store he concievable can and asking if they have a fish without a fin and gets more upset and guilty. He goes to a store in fucking France and just yells "I WANT A FISH WITH ONLY ONE FIN. IS THAT TOO MUCH TO FUCKING ASK? THIS IS ALL HE HAS, I FUCKED IT UP, WHY CAN'T YOU JUST LET ME FIX IT FOR THE LOVE OF THE GODS" and the shopkeeper is terrified and Marc realizes this isn't working. Then he goes home, buys a normal goldfish, stares at it for an hour before silently apologizing to Steven and letting him wake up