The tank has had its cycle before December. Been pretty good since with the exception of a fish or snail died and some trace levels bouncing on me. All the rock work and some corals were in another established tank before they got moved after the cycleThat does not sound like a salt problem to me. What values are we talking about, and how long ago was the tank cycled?
Most salt mixes have a little ammonia, and that is no concern. Nitrite is not usually significant.