bottom watering will do the trick. along with some dia earth and gnatrol (or similar) works great. i use a shop vac to suck them out of the air along with yellow stickies to track their population.
Granular Biological Mosquito Control
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Contains BTI that effectively and quickly kills mosquito larvae
Safe for birds, pets, fish and wildlife
Ideal for rain barrels, birdbaths or any standing water
Put 9 pc in a gallon of water shake and after 7 hrs water