Sorry but much of that is wrong!
Maps aren't all aquatic...they need a basking area above the tank without a lid on the tank (all turtles require a tank without a lid, humidity builds up and causes respiratory infections). They require a basking area, with heat lamps 10degrees above the water temp, and a UV bulb.
Musks are more mostly aquatic but still require a basking area in cause they use it!
Also the turtles will eventually try and eat fish...some mix, some don't...it's just personal experience and the individual turtle.
Musks will struggle when they are young, but providing stop and resting places in the tank on the way up would help.
Turtles are very messy creatures and filtration would need to increase two fold, as well as maintenance being increased.
Also that size tank would be more than large enough for 3 Musks (however they do much better solitary, so would recommend one, unless breeding in which cases its one make to every two females)
A red eared slider however maybe ok depending on whether it was male or female!
Full sized female of 12+ inches wouldn't be ok
Male who would reach between 8-10 inches, should be ok.
However most people believe they require indoor ponds when fully sized
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