Those berry plants will get really big in size in hydro fro leaf and root. If you end up pulling half them after they get started the roots will be enter tangled and you'll be leaving all that root matter enter twined with the still growing roots and can add to disease and or rot. Just a thought i had when i saw the picture. ! plant can easily cover 1 sq ft. they will fight each other to grow. I have agro towers and they only do 5 plants at a time around a much bigger circle and they fill up. But it looks cool.
http://agrotower.com/