Coraline after 4 days into a cycle with dry man-made rock? Are you sure it's not cyano? Please don't use a live fish until your system is cycled. Drop 4 flakes of fish food in a day until you spot ammonia in your daily tests. Keep feeding imaginary fish daily---and 5 days after you fail to provoke ammonia, you are cycled... 0 ammonia, 0 nitrite. Test your Mg, Ca and KH too and have them at the correct steady numbers
Also I am not adding any fish or inverts until at least Jan 28th