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  • Results 1 to 5 of 5

    Thread: What are these?

    1. #1
      kimini is offline Senior Member
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      What are these?

      Sorry for the blurry picture - these appear to be a larvae of some type and are about 1/4" long and attach themselves to everything. This is a 1/2" water height tube on my RDF. I've not worried much about them but recently, water flow to the RDF was slowing down. Running a brush through the bottom drains returned it to normal - for now, but I'm concerned these little *******s could become a problem due to their numbers. They're very tenacious and are hard to remove even with a water spray. Does anyone know what they are, what they're capable of, and whether there's any way to get rid of them without harming the koi or filtration?
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    2. #2
      inazuma28 is offline Senior Member
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      without a clearer picture I cant be sure but they look like the plant leeches I remove from my sieve trap pretty regularly. Although, I have never seen them in any great number

    3. #3
      ricshaw's Avatar
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      They look like Midge fly larvae. They attach themselves inside water flowing filter pipes.


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    4. #4
      ricshaw's Avatar
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      Apparently Midge fly larvae can be controlled using a bacteria called Bacillus thuringiensis.

      I have no experience using Bacillus thuringiensis which is sold at Lowe's, Home Depot, and Amazon.


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    5. #5
      RichToyBox's Avatar
      RichToyBox is offline Administrator ~ WWKC BOD ~
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      The BT is the same bacteria in mosquito dunks. You might try them. I found the ones that I had to have some form of hard shell skeleton and used Dimilin and didn't have a return. For years I would pull a cotton mop head through my bottom drain lines with a piece of rope attached to remove them, but after the Dimilin, no more need. You could try both.

      "Our goal is to assist with emergency and Koi health issues, as well as educate on best practices. Please help us gain a clear picture by giving the original poster time to answer our questions before offering opinions and suggested treatments."

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