Aquarium Pyramid

Aquarium Decoration Pyramid

Pyramid with 3 Openings and Lip at the bottom, to weight it down.
 

Original Model Size:  Base: 105mm Height: 125mm
                                             Walls: 1mm + 0.6mm Bricks

Print solid. 

Also added a Model with no Openings, if you want to scale and make your own

And the Onshape Document, if you want to customize even more:
https://cad.onshape.com/documents/e322b4265f10baad50ca9b86/w/8ba2d8d90f2ade065eb0e822/e/484529c7ca262c1263946790