I'm looking for advice on keeping turtles. The main thing I'm wondering is if there are any that are fully aquatic and don't require basking areas. Basically, I want the tank to be full and to just use fishkeeping equipment (filters and such, probably Aquaclear). I'm planning on using a 75 gallon tank (I can put them in a smaller tank if they need it when they are babies). From the research I have done, It looks like the loggerhead musk turtle might be right up my alley, but every guide says to include a basking area and then implies they will never use it (also, almost every video I've seen that mentions it basically says the same thing, "Make sure to include a basking area even though I've never seen any of my 79 turtles use it!").
Also, do fish ever bother them? If I kept a loggerhead with, say, tiger barbs, would they be capable of hurting or stressing out the turtle? Yes, I get that he will probably eat some if he can catch them.
Any help or advice would be appreciated.