Oh no! D: I am SO sorry to hear that. :( That is so unfortunate... I know he was as happy as he could be with you though, really. You did everything you could, even with the finrot. I'm really glad and thankful that I found you to adopt him regardless of his passing. Good luck in the future.
Unfortunately, I have bad news. I returned from a weekend camping trip/service project to find that my tank underwent a mini-cycle (it's the only explaination I've come to) and Möbius succumbed. Add the effects of the ammonia spike to the stress of medication, and it was too much to handle. I'm sorry. I made sure he had a decent burial at least.
No, it's not creepy, I understand. I'm ordering some antibiotics today, but I'll let you know if that plan drops. Other than his fins looking sad, he's actually quite healthy. He's completely acclimated to the household now, and has become quite the little moocher. He's recently taken to sleeping next to the side of the tank closest to my bed when he's not in his driftwood.
His name has an umlaut?! That's even better. 8)b XD
So great that he's eating well too. Haha, reminds me of how, when I would feed them, he'd occasionally try to jump up and swipe the food from me, but never make it higher than half an inch because of his heavy fins. :p (Which is a good thing on my part!)