Copepods

[Larry L]

My breeder tank continues to have copepods I broke the tank down once but they came back anyone no how to get rid of these pests they are like fleas .

[FishFanMan]

I too had them in my small grow out 20 long probably due to overfeeding. They also live by the thousands in your filter so the way I got rid of them was to nuke it all tank and filters and bring over my hob from my main tank until the cleaned filters got seeded.

[DJW]

Its amazing how fast those little creatures can dart through the water. I think of them as fairly harmless and they probably are everywhere in small numbers but especially in planted tanks. I see occasional outbreaks when I'm using infusoria and/or baby brine shrimp and haven't cleaned the fry tank very well after feeding. They usually show up along with Hydra. Hydra are a threat to small fry though.