Opinion on nutrients

Hi guys,

Running a 8 Northernlight clone grow in a 3x3 tray (keeping best 6) under a 600w. I am currently growing in vermafire.
The question is are nutrients nessesary during veg if no obvious deficiencies arise? Same question for flowering?
Ive heard great things about heavy 16 products, are they worth the price? Will they noticeably increase yield?
 
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