These 3d printed planters are perfect for growing or quickly propagating plants out of your aquarium! Lots of common houseplants love the nutrient rich water and they even reduce nitrates in the aquarium. This planter works great for Bacopa, Pothos, Philodendron, Swiss Cheese plant, Creeping Fig, Lucky Bamboo, Arrowhead plant, Bella Palm and more. These planters are surrounded by many small openings to ensure flow across the roots of the plants inside. The small size of the openings also allows the option to fill it with any fine gravel substrate. This is better for plants that prefer to have their roots buried. Small -50x20x60mm- Designed only for "nano" rimless tanks with up to 6mm thick glass. The small size is only good for propagating plants without taking up too much space in your tank. Medium -70x40x70mm- Works with rimmed or rimless tanks with a rim thickness of up to 20 mm. This will fit most 2-30 gallon tanks. Large -80x50x100mm- Works with rimmed or rimless tanks with a rim thickness of up to 32mm. This will fit up to 125 gallon tanks. The large and medium sizes are great in nano tanks too. I would recommend these sizes for keeping plants in them long term.