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Dry rock can indeed add ammonia sometimes. Think about it. When its added to water it can re-start a decaying process if stuff is still on it. First, brush it off real good under water with a stiff brush. Test the water anyway after adding it. Never assume that because it's dry, there'll be nothing to decay further.
Okay, thanks.. I was just told not to add it b/c it slows the cycle time and can cause spikes out of no where.... I guess it makes sense now... Thanks for the help
No, but I am trying to piece together my costs as and try to get it right the 1st time w/o problems... My Lfs suggested against it but during my research it seemed recommended that I use mostly dry