Can anyone help diagnose ? First grow

First grow

3 gallon pots. 400 w hps. Canna flora. Week4 flower
Watered when needed/nutes. Have those flies in the soil. Temps between 71-79. Not so humid.

Hey, could anyone helpe me understand what is happening here? Im beginning to be a little stressed out.
Havent got to check ph yet, the ph thingy was broken (-.-). But tapwater here is pretty good. Been in 3 gallon pots for 2 months. Flushed one time. Had no signs like this before 12/12 and untill 8-13 days ago. Thats when I first flushed them. Was a bit strong with the nutes I think, I thought it was nitrogen diffinency at first. Also, I had to bend some of the plants down in the start of flowering and they are the ones that are the most “looking sick” now, could it be stress aswell? The bent ones has more “colas” on em, but they develop slower. And was first to show problems. Is pot to small for minimal LST?

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The linked pictures says calcium deficiency. Adjusting your ph is imperative, good water or not. By week four I expect to start losing the bigger fan leaves. It’s also when I start to increase the amount of potassium being used. Also pot size isn’t helping matters. I run at the least 7 gallon pots. 10 gallons pots work the best.

Thanks! Will try to get some calmag and a pH tester then. If its not too late to fix it. Does the plant die fast if its missing these nutes or if the ph is off? I could harvest in 2 weeks at worst. Im also suspicious that the plants are maybe rootbound. Havent checked that yet but its alot of roots at the top at the soil, right under the top layer. And I can lift out the whole soil/plant when its dry. It drains a little slow.