Problem: Browning tips curling upward, brown/purple dots appearing on leaves and turning a light green/yellow color
Medium/grow method: soil ocean forest + perlite mix in 3 gal smart pot
Feed: and supplements used:
trio half strength every other watering
water source: RO with occasional 5ml of calmag plus
Strain/age:blue Himalayan by short stuff, 50 days
light used: 600w vipar led on 18/6
Climate: 72-80F , 50-60% RH
Additional info:
Medium/grow method: soil ocean forest + perlite mix in 3 gal smart pot
Feed: and supplements used:
trio half strength every other wateringwater source: RO with occasional 5ml of calmag plus
Strain/age:blue Himalayan by short stuff, 50 days
light used: 600w vipar led on 18/6
Climate: 72-80F , 50-60% RH
Additional info:
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--- yeah, it looks Ca defc. to me too,... as long as you use the RO, use the Ca-mg along with it since the RO has basically zero mineral hardness (CaCO3) in it,.... I also see other possible issues, from the looks of the broad yellowing patches,... might be P defc. starting too, but possibly from lock-out, not lack-of,... first concern is the OF soil, notorious for lousy pH issues, talking low 5's on bags I have tested,... coupled with the RO (no pH buffering from minerals) and the acidic feeds, it's likely the pH has gone off range,... get much under 6.0 and P starts to lock out fast,... what's needed is an in-pot pH, but unless you have a quality pH probe, this will be more difficult to get accurately,... (Control Wizard makes the Accurate 8 soil pH probe, perfect for this application).... the alternative is run-off checking, which is dubious at best,... but it can give a crude estimate so we can make some sort of call on what to do next,.. adding more nutes when soil is off pH will make matters worse! Have you calibrated your pH meter recently? .. gotta make sure that's talking sense as well... How often do you feed, 2-3x /week? ...next time you water only, water heavily enough to get about 15% run-off, and collect enough at the end of run-off (not the first stuff out!) to get a reading off the meter,... let us know! 
