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Can be form natural products, like leaf litter or tree branches. Can be food, can be the hand - aka, digging in the garden, and then putting your hand in the tank without washing it (or washing it properly)... Basically, there's many ways for a way to make one in, and then all they do is divide an conquer!
Remember, it depends on the species. Some solely eat microbiological life/plant matter, others can predate on other organisms. The species I studied in the lab C.elegans, we fed them bacteria - I think it was E.coli off memory, but I wouldn't be surprised if it was something else we had growing for it to eat...AwesomeHermit wrote: ↑Tue Feb 05, 2019 6:50 amNematodes have also been known to wipe out colonies of isopods. I also heard somewhere on here that they live in moist substrate.