Need some help, I seem to have an unknown hitchhiker. This morning, my frag was sitting in the sandbed, by this afternoon, it looked like this;
I know the picture isn't real clear, but it is in a hard to get position. The frag and rubble were attached to the larger rock.
I know I have a pistol shrimp in the tank, but never heard of them gluing or webbing rock particles together.
Anybody have any idea what type of critter might do this?