@MangoDudu,
Thanks for shedding light on that growmie. Been struggling to find / understand the watering feeding regime for weed in general. Most sources on the web aren't really clear how cannabis should be fertilize / watered pointing the finger at the fert manufacturer so I find this topic vague and something I should have a good grasp on.
I think you're also on to something with the ph calibrations. Readings take a long time to stabilize on my cheap 30 quid pen so there's more guess work involved than I would like which I think is what killed the last plant (on top of chronic overwatering).
I should get a better ph meter and use this to double check readings / as backup.
like