Keeping a rainbow shark in an outdoor pond

[brown_raptor1986]

I have a medium sized outdoor tropical pond that is currently home to my black pacu and CAE as well as a trio of red-cheek barbs. Would it be possible for me to add a rainbow shark without mayhem being the eventual outcome? Thanks in advance.

 

[johnnymax]

What size is your pond. The shark should be fine though. I assume you keep the water warm year round.

 

[brown_raptor1986]

It's ten feet long and five feet deep. Since I live in a tropical country, I don't need to use a heater to keep the water warm. Thanks for your response, much appreciated.