New test... how long does it take a tank to uncycle... I put all the nice Fiji cycled rock in my 40g breeder tank. Put all my old live rock from my old 29 gallon tank in this tank. I'm not going to feed the tank at all... oh and the tank has nolive stock. I was going to dry all this rock out and start over with it anyways so... just for kicks I thought I would do this.