Are those all supplement bottles I see? Typically corals get all the food they need from the water column and no added chemicals are needed. As a rule you should never add something you can't test for,
I think you have good hardware and the jump to reef shouldn't be too tough. Not sure how or what corals you can keep with those LED
;s, but you should be able to keep beginner stuff for sure I'd think.
The only thing I can think of adding is another powerhead for the other side, I run two on most of my tanks and it keeps the water from pooling in dead spots.
Hope that helped a bit.