It looks like your in the middle of a cycle if you have all three evident. But it's mid cycle since you have nitrates.
Before you buy any more rock I would very very strongly urge you to spend the $20 or so and get the master saltwater test kit. Do you have a fish store around that can check your water to confirm your results? The old ammonia tester could be way off....you might be busting your hump for no reason. lol
just my opinion but either way keep up the pwc
as to the lr
being cured, was it out of water for any time at all? It could have had die off even though it's such a small amount of rock. The rock is supposed to be the filter in sw
, well 80% of it anyway. The established tank may not have cycled properly to begin with. just don't know for sure