plants are filling out nice! Going for monsters I see...suprised you have a deficiency already in such large containers. I have not run into any nutrient issues ever until about week 3 of bloom when the girls start pulling hard. I use Happy frog soil,worm castings, extra perlite,touch of vermiculite and gaia green dry 4-4-4 and bloom 2-8-4 at half recommended dose. Cheers man!