To be safe I would let it go for another week with testing just to be sure. The already cured live rock really speeds up the cycle though; im just not sure by how much. Was all the rock fully cured? Im thinking that that is the reason and the little ammonia you saw was just the die off from the transit.
Theres no good reason to skim as it will accomplish nothing. If anything it will slow down the cycle but other than that, I dont see any harm in letting it run to break it in.
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