I just got some fake plants, and they have a larger bottom to them that looks like it's shaped to make an "anchor" to keep it in place. But it's only big enough to capture something small like gravel. Way too small for the river rocks I have in there. Right now, it's kinda staying on the bottom, but if the turtle knocks into it, I'm sure it'll break loose, and float to the top. Is there any way I can fill the bottom part with something to keep it from floating to the top?
Also, what could I use that is turtle-safe?




