to use sugar daddy or not?????

guy at hydro shop told me to avoid sugars in summer time if temps are above 70 f anyone else heard of this what do the sugars do for me what will i be missing if i skip these nutes i just got 12 site ebb and grow system and have monster kush feminized seeds in rockwool with 300ppm(on com-100 hm digital meter) ph 5.8to 6.0 i need advice any opinon appreciated
 
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