If you’d like to run a fuge little ocean makes a baffle kit that splits the sump into skimmer/fuge sections. I’ve been running one a while and works well.
My current RSR250 sump setup
And if your only interested in an algae reactor it really depends on your budget there is enough space in the sump to make almost anything work. You can go as cheap as DIY or as expensive as a pax bellum.