Your numbers look good. I see you have the coral sitting on the bottom, with little space beneath it. That shouldn't be a problem in and of itself, but it makes me wonder if it's getting enough flow. When leather corals shed, they need some flow to help clear away the dead outer skin. That yours has algae growing on it also leads me to believe it's not getting enough flow to keep it clear. I've never experienced algae growing on any of my leathers, and I've had GHA overrun and kill a number of other corals before I got it under control.
Unless someone more knowledgeable chimes in, I'd advise slowly increasing the flow to it. Turn up or reaim a powerhead to get a little more water moving over it, then leave it alone for a week or so to see how it reacts. Slow, incremental changes are best.
You can place an airstone behind your powerhead temporarily and let the bubbles help you see where the flow is going in your tank. I find this so useful that I actually installed one permanently under the intake to my return pump so that I can create bubbles any time I want just by opening a valve. A limewood airstone works best because it creates microbubbles.
