go for it i think they will do fine not to mention you will have thick budz all the way down her if you use lsting good luck
i love the ff stuff i still use the nutes with my coco just the coco is cheaper but deff better to have during flowering maybe i'll run 2 - 4 big trees got some bigbudxwhite widows coming thats what ima run
just start early to get the best results and a 5 gallon pot is fine but bigger is better in my opinion im sub'd i wana see the outcome good lucknever did the lst thing guess now its about time that i start