You don't want nitrites or ammonia. A clean up crew will need to be fed or they will starve. Your tank is new so there really isn't a need for a CUC. Most people I think have this misconception that a CUC is need. There nice to look at and maybe at times helpful.
But for the most part it's for your viewing pleasure.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley