Hygrophila Difformis (Water Wisteria) has deep green emersed leaves that turn to lime green and is a great mid-background plant. It it easy to keep but a shortage of micro-nutrients will lead to pale leaves. Size: 20-50cm Optimum pH: 5 - 8 Lighting: medium to very high Temperature: 22-30 degrees celcius Difficulty: 1 (1 = Easy 5 = Difficult) Plant Arrangement: Mid-Background Bunched with a lead weight on the bottom to allow the plant to sit at the base of your aquarium.