Hello Everyone!
I have a 186 gallon corner tank. I want to house 6 Oscars and 4 White Tip Sharks (Columbian Sharks).

Is this to big of a fish load for my size tank? What would you guys recommend?

Thanks!

In that tank, with a good filter, I would do 2 Oscars and maybe 2 Columbian sharks... Both get Very large!

Colombian sharks need saltwater when they mature right?

They can survive in fresh to brackish to salt if acclimated slowly. ( I was told)

Aggreed with Nickisue on the amount of fish.
Plus mixing brackish in with Oscars gonna leave you with 2 setups in the end.
Not that I object to that, I got a case of MTS too, but it's something to take into considaration.

Guys my columbians were fresh! S%@T I kept them with Koi!

But did they live up to their max lifespan?
Salt and brackishfish can often survive for some time but won't reach the age they could in the proper environment!

I had them for about 10 years, and I got them as adults from a woman in town. How long is there life span?

10 to 15 years.

How about a couple of oscars and some other cichlids instead of the sharks. If you like the look of sharks you could go with silver sharks (they are not sharks but look shark like), i like the look of them swimming around