purple stems/ white speck-bumps at base of plant,in coco

hey, new here. 1st time grow, plants are doing good in terms of growth BUT they are seeing purple stems and what not.. i know that could be a phosphorus lock out but not sure as they still seem to be growing pretty good.
problem number 2 would be that i noticed at the base or stock of one plant that there are white bumps.. is this rot/mold/mites??
 
the purple on the plants has kind of been around from the begining i just never paid mind to it... the twisted leaf is brand new. and the white spots are freaking me the fuck out, theyre new to
sorry english is bad
 

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