Frogspawn care

I think you could give it a try. Your lights are a little on the weak side, but I would guess it would still be enough for frogspawn. They don't require a great deal of flow, just enough to keep the polyps swaying around. Too much flow and they will retract.

 

regular water changes should suffice. With just the one coral it won't use up a lot of trace elements. You shouldn't have to start thinking about dosing until you get a pretty significant number of hard corals in there.
If you're wanting to start trying some corals its not a bad idea to get test kits for alk, calcium, magnesium, phosphate, nitrates to make sure your levels are in the ballpark and stable.