Holy crap. I almost don't believe you that it's low tech, unless it's been running a long time. Tank looks GREAT!
Tank has been running for a year and a half.
Slow grower's with exception of the star grass on back wall.
Trying to learn more about the plant's before giving the gas a try .
Followed Tom Barr's NON CO2 method with exception that I still perform water change of 50 % once a week, or every two week's.