Looking to buy a RTC, some question first

[minizookeeper]

i was going thru some old pics of my fish and found one when my rtc was young. i dont know how to attach pics ill promise to show if someone tells me

 

[minizookeeper]

i figured it out here you go.

 

[Mystix212]

Even If I heated the outdoor pond?

What size pond would a RTC need in order to live a long life?

As big as your wallet can handle. Any fish is happier with more water. But I would say 16ftx8ftx4ft minimum for a pond.