It could be possible that your LR
was Cured mostly and there for there was no cycle.. I noticed this in my 55gal... There was a small ammonia and nitrite spike that lasted about 12hrs.. then it was done.. I added 2 perculas and continued to monitor and still nothing... I currently have a bubble coral, Leather, 2 percula's, and a yellow-tailed Damsel along with some odd hitchhiker corals.. I monitor the levels daily and so far a month into it and nothing
The people that I got the LR
from stated that they have had cases where people order LR
from them and Fully stock their tank the same day.. They advised not to do this but stated that people have without issues.. Continue to monitor your levels but just to let you know that strange things like my case can happen..