Introduction and filter question

My name is John.
I live at Assiniboia SK Canada.
It is in Zone 3a.
I have a 300 gallon pond outside which I'm enlarging in the spring.
I have moved my 3  6" koi, 1 8" goldfish and 6 2" comets inside to a 150
gallon plastic stock tank. What kind of  pump and filter should I use? My
outside pump and filter is too large.
Thanks.
--
John Stobbs
Box 1303
Assiniboia, SK
Canada S0H 0B0
[EMAIL PROTECTED]
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