some spots and curling and lower leaves yellowing

I have a few indica hybreds in my closet in deep water 5 gal. buckets. I notice some dark spots and curling with some leaves yellowing.Some leaves were drying .My humidity was low so I added wet towels and a small humidifier and reading is now 55 was 30-35.that seems to stop the drying Stocks are strong and leaf growth is great but I have these issues. I went back to 1/2 strength GH Flora, Micro, Bloom. did add some B52 and Cal-Mag in first change but left that out in last change to see if that was the issue. My ppm is low so it's not burn, ph is 5.8-6.0 . water temp is around 70-72. I'm using 3 240 LED'S and a few clf 1700 lumens.. Removed some leaves that were looking weak .there's 4 to 5 leaf stages and I want to start topping.I'm trying to attach pic but can't seem to find how on this site. Any help is welcome Thanks
 
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