dwc help???

my girls are about 3 weeks old but still small about 11 cm, so should i base my ppm based off age or size?
about a week ago i gave them 12% 1ml/l. im still using tap water (200-230) so I can't really track what they are drinking.

I'm using an grow micro bloom 1-1-1 ratio
 

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the girls are about 4 weeks old now kandy kush is really bushing out maybe too much...
any tips on growing in a tote it appears the plants branches are colliding with the other plants branches. one of the girls is growing right into another plant.
 
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