Crypts and lights

        From my personal experience tanks where sword plants did well in
had to much light for Crypts.  And vice versa.  While i run 80 watts of
power on my 50 gallon Sword tank for 10 hours a day, My Crypts only get
20 watts of light but for 16 yours a day on a 29 gallon tank.
        This might varry with the type of Crypt but from my experience
they like low light for a lot of hours.