aquarium floating mine no chain

This is a prototype design for an aquarium floating mine accessory. The bottom of the mine has a loop to which a connecting line can be connected to a fixed object at the bottom of the tank to hold the mine in place.

The safety of using 3D printed materials in aquariums with living creatures is debatable, so if you have doubts plan on using 3D printed parts in a decorative aquarium containing only plants, snails, and other robust creatures.