[rsivertsen]

The problem with injecting CO2 into an artificial container or an aquarium is that it out-gasses very quickly, especially in warm water, which Aldrovanda prefers, like some opened carbonated beverage going flat in a few hours in a hot summer day. The best thing is to have the Aldrovanda growing closely with the roots of companion plants where those roots emit a constant source of CO2 from respiration, and absorb the excess nutrients that the Aldrovanda gives off. They also need to feed, and a healthy population of zooplankton is essential for Aldrovanda to thrive; small snails also need to be factored in as they will pull out the spent prey from the older traps before they get loaded with algae. - Rich