For sure!!! These sips give an ideal environment for plants to thrive, and they get huuungry. I just top dressed a second time with Dr Earth Flowergirl @ 4tbsp per plant. If you started with only 1 plant, it might even want more.
I put 4 plants per sip, then thin out the males. But what I think is happening, is during veg when the plants are building the root system, there is only so much room each plant gets. And by the time I switch to flower and cull the males, the plant is slowing down building its root system. So even though I only have 1 or 2 plants in during flower, they're root system isn't gonna fill out the planter. If you only have 1 plant, and the roots fill the whole sip during veg, it's gonna be able to take in a lot of nutrients, and it will be a monster. Just my theory.