Help finding the right fish for new pond

I'm building a set of two decorating ponds in my back yard. This is the
setup: Top pond is about 50Gal, water slides down from this pond through a
small waterfall into the bottom pond which is about 120Gal. I want to put
two or more fish on the bottom pond. Things to consider a the fish have
to control the algae and mosquito population in the pond, they have to be
low maintenance and resilient fish since the ponds are outdoors and
temperatures are quite hot around here. Any recommendations? do Japanese Koi
and plecos get along? can they survive on the same type of water? any other
type of fish that feeds on mosquito larvae (in addition to the supplemental
food I would provide of course).


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OrSoBoT
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