ReeFlowers Mr. Turtle provides the natural minerals required for skeleton and shell development in turtles that may be insufficient in tap and drinking water, providing faster and healthier shell development. Mr. Turtle can also be used as a food additive (in small quantities) to enrich mineral content. It is recommended 1ml of Mr Turtle be added for every 10 litres of a terrarium water on a weekly basis (for one average loaded aquarium). For larger numbers of turtles the weekly dose can be doubled or tripled.