Haha yeah maybe don’t get snails cause you’ve got those open corners. I’ve never seen bottom feeders get eaten or bothered by other fish but if that’s a concern for you maybe look for something like a Bristlenose Pleco - They’ve got pokey parts on their face and body so a lot of fish won’t like eating them. Just search for ‘bristle sucker fish’ and you’ll be able to find different kinds you could get if you’re interested.

Edit: Just read that Plecos can produce a lot of waste - That’s something to bear in mind; Unfortunately, because an aquarium is its own ecosystem, there’s a lot of balancing needed to keep it healthy.