I keep a juvenile common musk turtle, aka a stinkpot, with my central Americans including an Oscar. They are all juveniles right now so I'm not sure how there relations will work as they mature but for the most part the turtle and the fishes ignore each other unless the Oscar wants to push someone around but that's not too often. The firemouth is relentless with the turtle however but usually the turtle just treats him like an nuisance more than a threat and just goes about his business while the cichlid hopelessly attacks his shell lol.
These turtles are mainly scavengers and are bottom walkers more than swimmers. People will tell you that you shouldn't have them in deep tanks because they'll drown but as long as you give them drift wood, plants, or rocks they can climb to the surface and sit on they'll be find. I've seen them walking along the bottom of a lake that's around 7feet at that point so an aquarium shouldn't be a big deal. They aren't avid baskers like sliders and stuff so they don't "need" UV or even a basking spot but it's best to provide one anyways just incase. They don't get large either. The max size for a male is around 6inches, and that's a huge stinkpot, you could keep a single adult in a 20 gallon aquarium without issues though the more room the better.There are a couple different kinds of musk turtles though including a giant one but I couldn't tell you how they are with fish, the stinkpots though aren't good fish hunters and I've seen people keep them with community fish like guppies and cories.
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