Man I feel for you! I'm sure your pal was trying do it right but as you know you need detective's eye for it. Overwatering often equals root rot, so I myself would have started all over again (it's 'just' 3 weeks in), cause you can't say if they will grow to their full potential after this stress. On the other hand they can fully recover and be beasts as Mrs Larimar was saying earlier, these plants have great resistance. Good luck bro!
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