Refugium algae

[TankLife87]

I recently put in the Fluval sea marine nano led light as a refugium.
I have noticed algae in the substrate I have.
The light is 10” above the water.
The water is 10” deep.

Anyone know a great equation to understand the light spectrums and intensities to set the light at?
Any overall suggestions? Is the algae that bad? Should I remove the sand bed?

 

[dbl]

Moved this to the aquarium discussion forum to solicit a response.