A friend of mine has had an aquarium for a few months and has just found what he describes as wiggly, skinny "white worms," the size and shape of fish poop, about an inch long each. They seem to be living in the gravel, some will attach themselves to the tank wall by their "mouth". Can anyone please identify this critter, is it harmful, and if so how can he get rid of them??
Thanks.
Charlie
Thanks.
Charlie