@OimRausch Yeah it has nutrients in it to start. Miracle Gro claims up to 3 months. I aim for 6.5ish ph when watering.
@MangoDudu I don't currently have a way to check EC. Would you recommend looking into a meter?
I top dressed with worm castings 2 weeks ago. Added 2 ml of big bloom to a feeding a week ago(this seems to have caused nutrient burnt tips). Today I top dressed them with FF Ocean Forest/perlite mix. From now on it will be ph adjusted water with half amount of calmag only. I can't tell if deficiency or toxicity is happening.
Thanks to you both for helping :)