+rep Mordgrow.
My two cents mate:
The idea of the small tub will work but you will have a hard time keeping your nutes and PH optimum unless you keep them really small i guess. I have had one plant in a 10 litre tub and in no time the roots filled it allowing me to only add about 2 litres of nutes.
I would go for a 67litre tub, with half the plants = less hard work and more optimum yield.
Looking good, shame about your ballast, we cna buy second hand ones here for $40
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