Grindal Worms (Enchytraeus buchholzi) are a smaller relative of the White Worm, but usually, only grow to about 10 mm and thus are an ideal size for most killifishes, rainbowfishes, etc. including both adults and larger fry (juveniles). It may take up to 10 working days (except holidays and weekends) before this order is shipped. If there are any questions you have then please get in touch before you place an order.