The Tunze reactor works very well at growing chaeto. The light is very nice and I empty a handful of algae every couple of weeks. I do have issues starting the pump after cleaning and I run a couple of different return pumps in place of the stock pumps. Now, I did not know there was a different power supply and I will definitely look into getting a couple. I have always liked the Tunze pumps and it will be great to start using them again! I guess I need to start reading manuals at my advanced age!