No mats...... Just six inch net pots, all the roots comin out the pots are turnin green with algae. Next run I'm gonna put a bed of hydroton, my other room has that setup and there 4+ft, growing over the light! Just a jungle! I can have 30 plants so I do two rooms 15 each, harvesting every 35 days. Therefore I don't veg much and keepem small, tight, tasty buds! I even grow in a little cooler temps, I hate it when it foxtails and gets all fluffy.....bullshit! Right now I'm just plain limited in space(height).
Kush