@Prom I'll be growing Northern Lights, White Widow, OG Kush, and trying my luck at Blueberry Cheese.
Should take the topping super well. I have found the trick with the fabric pots is to not move them. Once the soil has created a "seal" with the side of the pot, it is best not to move or change the shape of the pot. If you do, it creates a gap between the soil and the side wall of the pot which just drains all your water away, leaving very little moisture to penetrate the depth of your container. I can see how drawing water up from below will omit this.
"if your pots are a bit small... under 60 liter, i suggest to mix a few spoons epsom salt in the FF." - is this to be mixed in as an amendment prior to loading it into the velcro pots?
Thanks for all the guidance!