Hi Kapnel.
What water did you use to fill up your tank?
How many water changes have you carried out?
Do you have a skimmer?
Do you you have carbon & or Matrix in your sump (assuming you have a sump!)?
Have you used Microbelift Special Blend / Seachem Stability - helps to stabilise your tank in the first few weeks and months by adding the correct bacteria with either of these supplements.
What test kits are you using? Are they still valid (not expired) or is your LFS carrying out the tests for you?
You should be monitoring your tank daily (IMHO) by carrying out tests on Nitrate, Nitrite, Ammonia, Phosphate, pH, Alkalinity, Calcium and Magnesium and then take action accordingly. The changes will not happen overnight but will happen over a week or two depending on the bio-load in the tank.
A new tank should not be stocked with fish or corals until the tank has cycled fully. Clean up crew will survive if the parameters are within the acceptable levels.
Sorry for all the questions but there is no info on your profile regarding your tank...