Probably a good plan.
So if I am seeing this correctly , in your tank (I'd love a full tank shot to determine the distance from the light to the sand)
You should have about 100 par on the sand and that should be perfect
What that means to me is, you should be running the light for a min of 8 hours.(go slowly to acclimate ) Based on those numbers , and quite possibly a bit longer. The caveat being , there is a connection between photosynthesis and nutint levels. In laymans terms, you need fuel to power the process.