Automatic water changes on 25 gallon

[lapdog2020]

I had on my 30 g tank and worked like a charm. But sorry to say it was not a automatic changer. There was some manual duties that came with mine. To drain the change tank I had to run it to my drain with a ball valve. Since I hade to drains in my tank. The set up was drain 1 went to my sump and the 2 drain went to my change tank and my change tank went to my sump. Drain 2 had a ball valve that I could close so I could do a water change.