I have set up my first natural tank as a test so to speak. I want to be sure this system will work for my sister who has MS and cannot do weekly water changes. So far I have followed the instructions verbatim in Diana's book. I'm very happy. Water conditions have remained perfect for the first six weeks. I have one question. Why is a water change at 6 months preferable to smaller regular water changes? I do want the 6 month interval to work because my sister cannot do water changes easily but she loves keeping fish. She still teaches school full-time on a scooter but her energy during the school year is limited. So far I think your method will work for her. The problem is she is hesitant to put her tank in a window. What lighting would you recommend for a 20-gallon tall without direct daylight? My tank is between two south facing windows and gets 1.5 hours of direct sun in the morning and in the late afternoon. It's going gangbusters. Hers won't get this bonus.
Alice
PS I have read "Ecology of the Planted Tank" 3 times. Thank you so much for this book! I was an English major and I can understand what you are saying. My HS biology teacher would never believe I could learn so much! | 
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