On the skimmer, I would suggest the ATi Bubblemaster 250, it will do a little better than the ER RS250. You want to give yourself a little space on capacity to handle heavier bioload and feedings (for tangs, anthias, angelfishes, triggers) if you so choose to.
On lighting, you really don't need MH for fish only tank, why not just go with some good T5 fixtures or retrofits. I would go with 4x Koralia 4s on a 265g display tank. Just my 2 cents.
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