Aquarium HOB filter baffle

thingiverse

I wanted to lower the water level in my aquarium down to where the hang on back filter would permit, but that resulted in a tremendous amount of splashing, bubbles, and turbulence so I came up with this solution to handle the drop and let the water flow out smoothly from one side. It simply sits between the plastic rim of the aquarium and the filter. So far, it seems to be working just fine.