Lysimachia nummularia grows very fast and it is one of the most undemanding aquarium plants. It can tolerate soft or hard water. pH in the 6.0-8.0 range, and temp. from 10-29 C. This plant grows well in non-CO2, moderately lit aquaria, it prefers high light and CO2 addition.Lysimachia nummularia - This is a nice looking plant. Great in a coldwater or tropical aquarium. This is a bright green stem plant. You can use it as a background plant or middleground plant. Fast grower. Propogation by clippings and sideshoots.