Hello, new heare , new 75g tank 20lb live sand 20lb dry sand, 40lb dry rock, 10lb live seeded rock from lfs, all 75g supposedly ocean water from petco, the box kind. Two clowns, two goby, bonded pair, test every week for everything 0's across the board everytime. Slight diatombloom across substrate but still no measurable anything. So my question is did it cycle, or does not need to since the water i used???? I have done 5 g water changes every week and use a rodi system. I fell like something is not right???