Yeah it doesn't surprise me your Rotala is doing well, you supplement CO2 and I never did. I also used tapwater to top off and water change, which is generally bad... but I never had algae problems, and everything else I tried grew well save a couple of
Echinodorus boliviana that lost the tissue between the leaf veins within days of being planted. Strange, and never had it happen to any other plants I tried. Mind you, I never did try Echinodorus again
