Aquarium inside hang in back planter for aquatic plants - designed for a specific aquarium, but should work in many.

thingiverse

Decided to try to design a planter to hang on the inside of the aquarium in the back. Turned out to work very well. This is four halves. The side with all the holes faces down. I had originally planned to attach the halves to each other using zip ties -- this is why there are three holes on the front an back along the seams. My friend, who printed them, instead sanded the faces of the edges of the two halves, and superglued them which seemed to work well.