i just wanted to take a second to express how awesome this autotopoff.com product is. I used their stuff years ago on my 195g setup and 4 years later I’m using it again with my apex unit and a brs pump again! I use the dual float switch option. This is just such a solid system. I do not work for them or anything, but have always loved this setup. It’s all mechanical float switches nothing fancy like the tunze but with the help of the apex it’s just exquisite!

