I am picking up a new (to me) 220gal tank with filters and all gizmos imaginable about mid february. 
It is coming as a fully functional Saltwater tank, with over 200lbs of live rock with the best bacteria and life (practically purple), as well as a few clown fish and cleaner shrimp... not to mention all the cycled salt water he is sending me home with in 59gal barrels.
The filter has been cycled and is rich with all of the bacteria needed to sustain a healthy tank..
I am not sure if I want a salt water tank... this is my issue.
Would it be stupid to clean all that bacteria out and sell the live rock and just turn it into a massive freshwater tank??
Or should I keep the salt water stuff and get a shark or some other cool predatory salt water fish?
What sounds like a better Idea?

It is coming as a fully functional Saltwater tank, with over 200lbs of live rock with the best bacteria and life (practically purple), as well as a few clown fish and cleaner shrimp... not to mention all the cycled salt water he is sending me home with in 59gal barrels.
The filter has been cycled and is rich with all of the bacteria needed to sustain a healthy tank..
I am not sure if I want a salt water tank... this is my issue.
Would it be stupid to clean all that bacteria out and sell the live rock and just turn it into a massive freshwater tank??
Or should I keep the salt water stuff and get a shark or some other cool predatory salt water fish?
What sounds like a better Idea?
