Whatever you do NEVER look at old growth. Old growth is old news you should be paying attention to the tips of your new growth. If your tips show any brown that’s a sign of overnuting. The other problem growers have is overwatering. You should always let the plant uptake all or most of the nutrients before adding more. I use the weight method & only bottom feed. A wet top is the perfect breeding ground for bugs. You can say all you want “I don’t have bugs” “I’ve never had bugs” or “I never have problems” All mediums have bugs in them. The best way I’ve found to best rid that is to freeze my bag of coco. It seems to kill any bugs & their larvae. Sry I’m rambling this Gushmintz keeps me talking forever, yes most bags of medium have bugs, however when I buy a bag of dirt I throw some de earth in the bag 3 days before starting no problems ever.