Floating Aquarium Sea Mine

A sea mine on a chain, designed as a climbing challenge for a pet crayfish. Its two halves hold a standard table tennis ball (not included) so it floats well, even with heavier crustaceans on top, and twist-lock together with three pins, so no glue or fasteners are needed. The print-in-place chain is sandwiched between the halves, and the extra large base is held down with a couple of stones. Four holes take an optional screw to attach food to.