35 gallon cube started it about a month ago with 55lbs of fresh live rock straight from an established tank. Waited about a week and a half still tested 0 for nitrates nitrites and ammonia. Added 1 fire fish and clean up crew. 3 weeks since adding all those everything is still living fire fish is eating and looking happy. But still testing 0 across the board. When shouldn't I have some sort of nitrate reading. And when should I do my first water change. Also when da. I add more fish.