I've had good success with both IO and reef crystals in my full sps tank. I stocked up on reef crystals at the big als boxing day sale so will be using that for the next year. I can't justify buying the expensive salts when I get good results from the low priced options.
Sure there is a bit of a film on the top of the water when I mix a fresh batch but it really doesn't bother me. I just skim it off before adding the water to the tank.
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