Tropic Marin salt

it is incredibly pricey, but i rarely ever have to add buffers or trace additives to my aquarium. never had an issue with nitrates or phosphates either
 
I use it and I personally think that the extra cost is worth it, its very consistant and you get an extra 40 gallons out of a bucket. I also got a great deal from Kenny when Petmart was still in Batavia so I stocked up.
 
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