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Fungus gnat larvae in my reservoir!! Need help killing the little bastards.

Discussion in 'Hydroponics / Aeroponics' started by AN Addict 420, Sep 28, 2009.

    AN Addict 420

    AN Addict 420 Active Member

    Hello everyone,
    I just got the old ebb and flow goin again. It is a homemade system with a flat bottomed flood table and because it is flat a small amount of water is allowed to collect at the bottom of the tray (about 1/4 inch). I was checking my ph and noticed some little shits floating around in the bottom of the tray. They looked like Fungus gnat larvae. Since I have a little soil thing goin on too they probably came from there. Anyway, I was interested in any tips from others who have had similar issues. They arent causing any problems yet and I dont know if they will have anywhere to live (other than getting washed down into the res.) since i'm using hydroton as a medium, but I dont want to take any chances. Has anyone else had to deal with this?

    Barrelhse Well-Known Member

    You need Mosquito Dunks. Available at Home Depot and garden stores. They contain a bacillus that attacks mosquito and fungus fly larvae. Completely safe, no chemicals. I use them with great success. I also use them in dirt- crumble some and mix it in, and water with H2O from a bucket w/ a Mosquito Dunk in it. Again, they really work.
    Muffy likes this.

    Muffy Active Member

    What he said. ^^^
    AN Addict 420

    AN Addict 420 Active Member

    Wow! I didn't think it would be that easy.
    Thanks a lot guys!

    Limosnero Well-Known Member

    Had this happen to me...kind of look like saw dust floating on top of the water. Found out they were Symphilids. Went absolutely crazy in hydro. Didn't try the dunks but SM90 did not work. Here is a close up...


    beardo Well-Known Member

    ive got same problem i think their fungal gnats but maybe ive got the things limo had the symphilids im trying ceder oil

    rich.post Member

    Dunks FTW!!
    ak.fortyseven likes this.

    glann Well-Known Member

    I know this is old, but I have a question if anyone can answer. If the dunks use a bacteria( I think that's what bacillus is) will it be effective in a sterile reservoir? Wouldn't h202 or physan 20 kill it before it could kill larva?

    dirtysnowball Well-Known Member

    i've heard of people adding a little bit of h202 and it kills the algae, mold, and fungus

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