Would it be okay if I put 4 Bala sharks and 2 silver dollars in a 75 gallon tank?

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Something to maybe look at that may be somewhat similar to Bala sharks but stay much more manageable in size for a 75 could be filament barbs. They grow to about 6", very active, and not as skittish as silver dollars that smash into the sides of the tank when spooked.
 
Yeah them filament barbs are just nuts. Probably the busiest fish I've seen. Best way te describe them is a fish with ADHD. Crazy bastards they are..
 
Yeah them filament barbs are just nuts. Probably the busiest fish I've seen. Best way te describe them is a fish with ADHD. Crazy bastards they are..

Hahaha, yeah they are non-stop moving. But don't tend to freak out like silver dollars do. Silver dollars are fish with panic attacks lol. Just be chillin' one second, then slam their faces into the glass the next hahaha
 
Balas are definately to big to house correctly in a 75.
A shoaling fish that can grow to 15 inches,it's a no brainer.
Most silver dollar species are also unsuitable in my opinion. To be truly happy they need to be in large shoals in tanks over 6 foot. In small tanks in groups of less than 6, yours chances of skittish fish are high.
As already mentioned, lippincotianus is probably the best choice but I would get no less than 8.
Red bellies grow to around 12 inches live in shoals and are messy feeders.
You won't be able to keep many adults in that tank.
In my experience small numbers of natteri produces a boring display of skittish fish that hide a lot and hardly move.
Personally I would have a re think.

As far as Bala sharks looking aggressive,do you really think so?
Nothing but the made up shark name is remotely aggressive to me.

Have you looked at dwarf snakeheads?
Some won't grow much more than 6 inches,look aggressive and are true predators.
 
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