These last few days I have been trying natural sunlight on my nano too. My tank is in a location where it sees the afternoon sun.
One noticeable difference is I have more PE on my tenius & I noticed Xenia pulsing more violently! Never seen such PE before & the tank looks great with the combination of sunlight & AI prime. Colors just seem more vibrant.
I'm gonna continue experimenting to let in natural sunlight & see how the corals react, so far it's looking gd! Will be keeping a close eye on the temp though!