some grow questions please help

I have a clone of super sour diesel and it’s 11 weeks old still in veg under a light with 5 other plants that are 7 weeks old. I’m running a 6 build t5 fixture with 4 cfls shining in each side of the plants. They’re in fox farms organic soil. Was using jungle juice grow for two waters but went back to plain water. Temp is 72 and humidity 64. Does anyone know what these speckles could be on my sour d?

And that brown piece on the leaf isn’t a bug or anything it was just a dry speck of soil.

thats the beginning of calcium deficiency
start adding a little calcium nitrate or cal mag to your feedings.
check your ph, its hard for plants to absorb calcium if the ph is below 6.2, but since you're in soil, that really shouldn't be an issue, you ought to be above 6.2 all the time anyway. don't go crazy with it though, its easy to add too much of something to fix one lockout, and cause another. if the cal mag bottle says to add 4 ml per gallon, id go with 2 ml per gallon for 3 or 4 waterings, then start adding it every other watering