What are the "best" reef aquarium supplements? Joe from the Marine Depot staff shares the 14 supplements he feels are "best" for his reef. Black Friday Weekend Blowout: Take 10% off all Maxspect LED, CoralVue, Reef Octopus, Elos North America and Flipper brand products with coupon code BLACKFRIDAY. OR use coupon code EPICSALE to save 15% off one single item of your choice! Some exclusions apply and coupons cannot be combined.