New test 

Ph 7.9
Mag 1210
Alk  11
Cal 550
Salinity 1.026
Nitrate 0.3
Phosphate  0.0
Nitrite 0
Ammonia 0
All tested with hanna testers 

This is 135 gallon tank with pro clear aquatic 200 sump, and octo classic 110-s skimmer   return pump is vectra m2, 1 power head ,  the lights are as follows 3 kessil a160we tuna blues  and an AI blade grow 66" then on sump is kessil h80 

Stock is 
4 clowns 
4 bangi cardinals 
2 yellow belly damsels
1 royal dottyback
1 blue hippo 
1 naso 
1 powder blue 
1 flame angel 
1 niger trigger 
All are juveniles 
1 lt nem 
1 candy cane
3 rock flower nems 
1 zoa frag 
1 favia frag 
1 crocera clam 
Any suggestions ph seems low just did water change 2 days ago 25% using blue bag red sea salt