Drop a raw shrimp into the tank and test the ammonia untill you see it at about 1 or 2ppm, then take it out (proably take 2 or 3 days at least but all depends on tank size) then take it out and ride out the cycle until ammonia and nitrite are 0 and nitrates show up.
My tank took about 3 weeks to cycle this way, with 2lbs of rock per gal..
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