Bleach
Just what I was going to say. Friend has a concrete horse tank that holds about 50 gallons. Keeps a couple goldfish in it to take care of the skeeters. One of them has gotten big over the years. Almost koi size now.Goldfish
Or minnows
Minnows won't eliminate them. Not unless you put an unsustainable number of minnows in the drum. Dad's water barrel had mosquito fish, gambusia affinis, IIRC, and there were always mosquito larvae in it. They couldn't keep up with the number of mosquito larvae though they ate bunches of the little monsters. It will help, not gonna fix the problem. Mosquito Dunks kill the larvae, and are supposedy safe for fish. I'd do both.Goldfish
Or minnows
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