I have recently made a small adjustment to the inlet/outlet assembly to help get better flow across the surface of the tank.
It also creates a nice shimmering effect under the lights.
To accommodate this design change I am now recommending a smaller pump like the Eheim compact 600.
The new outlet design will work with existing 1000l/h pumps however you will need to adjust the flow of your pump using the slider on it for it to work correctly.
If you have purchased a Marine-Pac in the last few weeks you are eligible for a free upgrade!
Just shoot me an email to register your interest and ill pop one in the post.