Marine Depot on 3reef.com reef forums. MarineDepot.com, founded in 1997, is an online aquarium supply located in Garden Grove, CA. MarineDepot.com offers more than 7,000 products with free technical support provided by a staff of aquarium experts known as the Reef Squad. All products at MarineDepot.com are backed by a 60-day money-back guarantee. And, if you find a lower price from another online store, MarineDepot.com will match the price and refund 10% of the difference. Orders placed before 6pm PST are shipped the same day and orders over $175 ship for free.