Any experts out there? What is your temp and humidity? What type of lights are you using? Should you bring your ph up to 6.5? I stole from another post on this great site.
Soil
Calcium gets locked out of soil growing at ph levels of 2.0- 6.4
Calcium is absorbed best in soil at a ph level of 6.5-9.1 (Wouldn’t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will contribute to a
Calcium Deficiency.