Anubias not doing well in a cichlid tank

[Mario]

I have some Anubias in my tank, here and there the fish bit the leafs, but lately some of the leaves are getting yellow.

The light is the aquarium is running for more then 6 hours a day.
Water change per week.

Any suggestions?
Any grandmother solutions?

Thanks in advacned.

[Aquaculture]

What is the wattage of your light and depth of Anubias from the light? Yellow most likely indicate that there is a lack of light.

[Mario]

70W and the depth is about 50 cn