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 Gettting Rid Of Midges-indoor Koi Pond, Kill Midges not Koi
Posted: Apr 2 2012, 10:00 AM


Group: Full Members
Posts: 1
Member No.: 5,898
Joined: 2-April 12

I have had an indoor Koi pond for over 10 years with no plants or problems. The pond has a filter & pump that runs 24/7 and I backwash the filter 3-4 times per year. I noticed about 2 months ago some small gnat type flies which my pest company says our midges. In researching it, it says they breed in water. When I did my last back wash I noticed a weed that had some way found a crack in side of pond under rock. There was a good size clump. I removed it and I am attentive to it but reading says flies look for decaying plant material so I think that may be cause. I will lower pond level this week and seal area, then refill. But midges prevail. The large 16 X 10 window slider next to pond and other windows in room show thousands of the dead midges that go toward light. While I vacuum them up, they keep coming! I need to get rid of them! Since they breed in water and obviously my Koi like their fish food more than larvae, how do I get rid of the midges once and for all since thet are probably in my filter and just keep breeding?Help!
Posted: Apr 2 2012, 04:44 PM


Group: Admin
Posts: 9,941
Member No.: 1
Joined: 1-September 03

Welcome to the forum!

Midge larvae as well as other aquatic fly larvae will breed in indoor aquariums and ponds. They don't have to have plants. I have them in my 65 gallon aquarium and even the turtle tank. They don't bother me; I don't have that many. If you want to kill them, the best way is to add Bt bacteria. When flies molt as they grow, this bacteria kills them. Bt is sold as mosquito dunks, bits, and Microbe-Lift liquid. Any of these should end their lives. Bt won't harm the koi. I suggest the liquid because the koi may eat the dunks and bits (even though it should not harm them, the filler in there is hardly quality food).

Good luck!

Robyn, Analytical Chemist, Zone 6/7, Maryland
Servant to 4 cats, 2 rabbits, 4 guinea pigs, 2 mice, 1 redbellied turtle, 3 freshwater aquariums (65, 50, & 20 gallons), 2 saltwater aquariums (6 and 12 gallon nano cube reefs), 7 outdoor ponds (1800, 153, 50, 30, 20, 20, & 12 gallons), 1 indoor pond (20 or 50 gallons, winter only), crickets, mealworms, and hundreds of fish (of about 18+ species), amphibians, snails, shrimp, corals, crabs, worms, and so on in those aquariums and ponds. A mostly full list of my current animals is at

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