Please, for the love of all that is holy, do not make this if you have neighbors.
https://www.youtube.com/shorts/R1Hq3WEqVeI
The video claims the smell is not "entirely unpleasant" but that's a lie. It is the most disgusting smell I have ever encountered. And I used to have to shovel manure and clean chicken coops growing up. Once I even had to dig a dead racoon out of the guts of a square baler after it got run over and jammed up the machinery and then sat for a few days in the summer heat. Garum smells worse.
Fish fertilizer is the worst smell I have ever smelled. Similar to how our dogs smell after they've rolled in rotting salmon carcasses on a stream bank.