The folks over at Digital Aquactics (they make that Reef Keeper Elite if haven’t been reading) are offering a crisp clean $100 for your old controller. You’ll get that $100 bonus if you purchase a Reef Keeper Elite they will refund $100 from your purchase price. What controllers does this apply to? Quite a lot, most all major models including: Neptune AC, AC2, AC3, AC3 pro, ACJr, Proflux/GHL, Aquatronica, Light House, Octopus are covered on this promotion. You can read the PDF for all the other juicy details.