New tank need help

[Hathehoang]

Hi guys. This is my 2 months old nano tank. 1 month ago i put some sps frag on top of the rock. All are hardy sps( bird nest, montipora) every going well. Little birdnest has some tiny branches. I do 10% water change per week with coral pro salt. My plan for dosing is 3 part of balling light. But for some reason, water parameter is not swing too much. I have tested every day and the parameter is still same. Dkh is 9, Ca is 420-440, mg is 1380-1440. No3 < 5. For 3 trace elements i am using sera test kit. And Api test kit for No3 and Po4. Did my test kit are inaccurate? Or any other reason here?
Much appreciated for the advice!
Thankyou guys and happy reefing!

 

[SPR1968]

If your using coral pro it has higher than normal foundation elements levels so your 10% weekly water changes may well be keeping up with usage.

If your mixing to 35 salinity, coral pro normally has alkalinity of around 11-12 and if your testing at 9 that may be replenishing what you need. I used it for around 12 months in my S650.

Only dose whats needed, and if it’s not don’t add anything