non so da dove tu prenda le tue informazioni ma...
dal sito carib-sea:
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What if I don’t want a lot of sand on the bottom of my tank?
Then use a 1-1.5 inch layer of one of the oolitic sands (Aragamax) or Fiji Pink. You can still get denitrification, and some calcium and pH support. You may need to boost the levels now and then with a 2 part additive, or by using the Aragamight powder in your top off water. Also, if you have a sump, its a great place to put lots of aragonite without filling up your main tank. A deep bed of aragonite in a sump can give you the same results as 3 inches in your main tank. See "Systems" and look for "Passive".
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costi: acrotropic - costava sui 55 euro per 22,68 Kg - 2,42 €/kg
aragamax costa 33 euro per 14 kg - 2,35 €/kg