Check out these 10 Saltwaterfish.com coupons including promo codes and free shipping deals for September 2017. The best offer today is a 5% Off coupon code. Save on saltwater fish and aquarium accessories when you use your Saltwaterfish.com promo code. Bring the beauty of the reef to your home. Shop tank supplies, lighting, sand and more. You're sure to make your finned friends happy with the great supplies available here.