I use the bulk reef supply rox carbon run it in a two little fishes reactor with some nylon at the top to hold it in it is tiny stuff. But it by the 5 gallon pail and it works out to be pretty cheap. I bought half a pail last time about a year ago still got a lot left. I run 1 small cup changed out every 2 weeks or when i fell  .
http://www.bulkreefsupply.com/store/...um-carbon.html
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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