Welcome to frog forum and frogging. I'll try to answer your questions best as i can.
First off, led's will work just fine for growing plants, but your color temps are too high. 6500k-6700k is ideal for plants. The 10000k's are great for algae, as you noted that they grow corals incredibly. You can always go trial and error on number of leds and the spreads. 40degree optics are seeming to be the trend in the planted tank world, but i haven't played with them.
I'm thinking that is you are not having a water feature, a sump is overkill. I'm all for filtering the water reservoir, but a sump and protein skimmer are just a bit much for water that is just going to be removed. Unless you plan on breeding, in which case an algae sump where the tads can live and grow and feed on algae would be helpful. I have one for my mantella tank and trust me it is actually a pain to grow algae......lol:





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