We have 3 RES aged 5, 5, and 13, so needless to say, they are bigger turtles. I was reading a post somewhere about someone turtle who had injested gravel and was vomiting blood. I do not have gravel on the bottom of my tank but was considering it, but am afraid that my turtles may injest it as well. What is a good, safe bottom filler for my turtle tanks?
Thank you.
Jamie Jobson

