You've been given excellent advice. I just want to give you one more suggestion that may help the situation you are in with those plants now. After a plant has been struggling like yours have, I would cut the leaves back by 30%. The plants are struggling to keep all that green stuff green. You want them to produce roots, so if they have less to worry about up top they may be able to concentrate more on the roots and not use their energy keeping all that green up.

Just a suggestion.

SN