Phosphate Reactor 150 (660l). Also for nitrate, algae, sand, purigen and carbon.
If the reactor is to be used as an algae reactor. with chaeto. Lighting wise for the algae, l would aim at 1m length of 5050 Waterproof (silicone covered) Leds, which should give you around 14w. Cleartides - PO4 Reactor 150.