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Silver tipped sharks are brackish so I'd do some research on that first...and balas are schooling so you need at least 5 an on top of that they get huge so make sure you have a large enough tank
If your wanting sharks I'd probably go with one red tail or rainbow but that means you could only have 1....maybe look up some rose line sharks...they are schooling but have pretty color
Then you want bigger than a 60 gallon if you want happy fish...doing more than one bala is not recommended in a 60 gallon and having only one bala is not recommended either if you want them to live happily.