Robuta

https://www.ozaquariumfish.com.au/product-page/vinegar-eels-turbatrix-aceti Vinegar Eels - Turbatrix aceti | Oz Aquarium Fish Vinegar eels are small (2mm) long nonparasitic nematodes. They feed on live bacteria naturally found in fermenting apple cider vinegar. Vinegar eels are a... vinegar eelsturbatrix acetiaquarium fish