Can anyone lend their opinion about whether this is light burn, cal-may def. or fungus? I use RO water, Mara hydro 400w it’s about 18-20” away, drip system.
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Time for bloom nutes and yes add cal mag to your feed
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Thank You for your response!
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Like @Bluntsmoke said
Hello @Jungianstrain
Looking good, nice and lush but you may need to adjust something. But need more data on your grow to understand what is going on.
Temp/humidity?
Grow medium soil/hydro?
pH and TDS of system
Nutrient line using
Are you using a beneficial microbe ?
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Definitely moving into flowering. Agree with @LateNightGardner on the things he asked. This blemish in the pic looks to be from a little splash burn from top feeding 
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Are they underwatered. Maybe look a little thirsty. Droopy under colored leaves maybe some canoeing down ward. If you feed or water and they stand up proud after a while that will answer that.
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Yeah my drip system may not be set long enough I’m thinking, also I think they could use some flowering nutes perhaps?
Temp/humidity?: About 78 degrees and 40-45% humidity
Grow medium soil: Fox farm ocean forest in the 2 ten gallons with 1/3 perlite and worm castings the 2 5g have happy frog and coco coir 50/50 also some perlite
pH and TDS of system: I have Reverse Osmosis that is consistently 6.8ph and I also have recently mixed in 1tsp per gallon into the drip system reservoir honestly got tired of TDS meter with its run-off readings, I know I’m putting in good ph water and also using build-a-soil craft blend and right before flower top dressed each plant with build-a-flower top dress
Nutrient line using: I was using fox farm but stopped using them 4 weeks into veg so about 6 weeks ago….instead trying to give organic nutes through craft blend, worm castings and the top dress method.
Microbe: Rootwise microbe complete
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Temp/humidity?: About 78 degrees and 40-45% humidity
Grow medium soil: Fox farm ocean forest in the 2 ten gallons with 1/3 perlite and worm castings the 2 5g have happy frog and coco coir 50/50 also some perlite
pH and TDS of system: I have Reverse Osmosis that is consistently 6.8ph and I also have recently mixed in 1tsp per gallon into the drip system reservoir honestly got tired of TDS meter with its run-off readings, I know I’m putting in good ph water and also using build-a-soil craft blend and right before flower top dressed each plant with build-a-flower top dress
Nutrient line using: I was using fox farm but stopped using them 4 weeks into veg so about 6 weeks ago….instead trying to give organic nutes through craft blend, worm castings and the top dress method.
Microbe: Rootwise microbe complete
I hear you on the TDS and pH testing. I use rain water from a catchment and it is consistently at 6.8-6.9.
I try to just check when I’m refilling my DWC buckets every 2-3 weeks. Between I only check my top off refill mix unless I see an issue then I’ll do a deep dive into my DWC buckets.
I think your plants are growing nicely. Maybe some CalMag for your plants in the coco mix. The temp is fine but your humidity needs to go up to between 79-69% with the 78F air temp. Once you start mid flower back your humidity down to 65%.
Check your TDS levels with this handy calculator.
By upping the humidity you’ll see more lush leaf growth.
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Yes, you know everything you say here makes perfect sense and I’ve been tracking my vpd ever since I got the Pulse environment meter about 6 weeks ago. I know that, I ideally, VPD should be around 1.1 but those numbers are not reachable if you want to follow the conventional idea that flowering humidity level should be around 40-45% to avoid mold and fungus growth etc. and have temps remain around 78-82 degrees F. I’ve been scratching my head about that one. So is it only in very late flowering that humidity levels should be that low because your recommendations seem to be focused on VPD? 
perplexed?
My original reply should have read “…1 tsp Cal-mag per gallon into the reserve osmosis reservoir…”