my small shrimp tank recently found many small (underwater) fly babies moving around the tank. Please advice how I could getrid of them without introducing fish in the tank... Thanks!
Net them out and dump into a tank with fish in it (if you haven't got fish, given them to a friend who has fish--they're great fish food). Or just net them out and put them out to dry somewhere (don't flush them) before you dump them in the trash.
