We just opened up our outside pond. But now I find a lot of mosquitoe larva in it. Will fish help kill these guys because I don't want a home for mosquitoes.
I have added four fish in the pond today. Will these disk kill the fish? And also the water isn't moving, should I get the waterfall moving?

If you have fish, yes, they'll eat the mosquito larvae. If you don't have fish, pour some bleach in the water. That's what I do with my rain barrel.

They sell mosquito eating fish. Mosquitos only occur in water that isnt moving so yes get the waterfall going.