Amazon has Instant Ocean Reef Crystals Reef Salt for 160-Gallon Reef Aquariums (44.8-lbs) on sale for $17.99 when you checkout via subscribe & save. Shipping is free. You can also order without S/S for $19.99, with free shipping for Prime members. Discount is shown at checkout.
- Note, you may cancel Subscribe & Save anytime after your order ships.