It's hard to tell from this picture cause it is blurry. but the top left is standard Carbisea aragonite, bottom right is the special grade. chemically it will do the same for you with the same benefits. Caribsea Aragonite is a finer grain than the Special Grade.
The special grade reef is just a more coarse, larger particle substrate than some of the other grades like bahamas oolite (very fine), and fiji pink. It's not really any better, mainly just comes down to what you prefer.
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