CO2 Pressurised Bottles
Using pressurised CO2 is the best and most efficient way to get carbon dioxide into your aquarium so that your aquatic plants can start benefiting. Aquarium plants are 90% carbon so if you are not offering them any, you need to ask yourself the question of where are they getting it from? I suspect if you are not adding any at all (not even liquid carbon) then you will struggle growing aquarium plants in the long term.