That sounds good
ya nute burn sucks iv done it lots it happens especialy in flower one week it's fine the other it's to much, but u did the right thing just try not to over water them tomuch/ to often. Your doing a great job
also a good happy medium for 600w mh is 15-20inchs as long as heat isn't a problem
even 24 inchs is fine but much more and ur plants my strech tomuch
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