I've been using Cidex(2.5% glutaraldehyde) instead of Seachem Excel in the past 7 weeks in my non-CO2 tank. It is a non-CO2 experiment for some difficult red plants. I add 5 ml Cidex every day and 5 ml Seachem flourish once weekly to my 42 G tank. The result is tremendous.


Four weeks ago, I also planted L. pantanal, which also grows well in this non-CO2 tank. KH = 3.5 dKH, GH = 6 dGH.