Thank so much for your help. I will look into getting a worm compost bin. WHere do you buy worms?
:you might consider buying a ton of worms and besides putting some into the pen, make a vermicomposting pile so you always have worms available. They are quite easy to grow and care for and they will breed rapidly, more than enough for one turtle. They are great for other things as well, like your garden, or any fishermen you might know.