You don't need to separate your lr
and macro algae. For your sand bed make sure it is 6in deep. Also I would look at adding a algae turf scrubber.( super easy to make $10 from home depo) I would have it set up like so: filter sock, protein skimmer and phosphate reactor if you want, liverock and macro algae, algae turf scrubber draining into macro algae and live rock section, then return pump.