What did you switch from? If anything. In a shallow tank like that (mine too) I'd turn it to 10/20/20 and go from there. Leave it at that setting for 3 weeks and slowly bring it up like 3-5% every week-two weeks. Seems excessive, but everything will be better for it. I definitely scaped my new shallow with light intensity in mind.
Im starting a nano for the first time using leds. I had broke down my previous tank and am back into the hobby with leds. Some of the corals i got from a lfs others from hobbiest. I know the water Q is good and the flow is good but cant seem to figure out intensity. I will be getting a 16 inch deep tank soon and will transfer everything. It just seems to me leds are really powerful. What would you start on a 16 inch deep tank?