Possible deficiency or burn?

Hello guys.
So this is my fist grow
Auto on coco
Nl
Ph 5.8

so I have had stunted growth due to it being to cold at the beginning of my grow and also had rust spots and possible other deficiencies of one of my 4 plants, I have flushed and tried to correct it but haven’t succeeded but hope was not lost as one of my plants it where it should be in term of growth and that was keeping my spirits up until today when I noticed yellow tips on the new growth.. which I didn’t expect as I haven’t changed the feed amount in over a week and the plant has been responding fine.. I would have thought it would nute burn but I can understand how
. I will also attach some of the pics of the other plants that been suffering in case anyone has had or seen these problems before

any help would be appreciated
Thanks guys

How old are the plants? Looks like cal mag deficiency. Are you giving any cal mag at all?

If not I would try a full dose of calmag and raise your ph up to 6.2

The flush you did, was not in your favor; coco grown plants don't take well to a flush. Keep that in mind for the future.

Full plant pics would be helpful as would the details of your grow; more specifically what you're feeding and when. From the few pics, I would say you're dealing with pH issues, not a full on deficiency, but perhaps your details will reveal more. Good luck.

I’m using canna full products a&b cannazym ect as half the recommended dose. Plants are 5 weeks old. My ph has varied slightly within a few 0.2.0.3 but can that make that much of a difference. My run off is good. I don’t have or use a cal mag sup as I’m on the understanding that you don’t need it when using a&b

The flush was a while back now and they’ve responded well since

.2 to .3 tenths off of?

Are you feeding your plants daily or allowing them to dry out between feed? Are you feeding plain water at all?

When you say your run off is good, what does that mean?

Your plants aren't that far off...but as you can see, they could be happier. I wouldn't make too many changes too fast for sure.

That sound encouraging thanks, I suppose being first grow I’m just over worried and confused to what’s going on sometimes . Yeah .2/.3 I feed daily... I was feeding twice and a day but I’m in 5 gallon fabric pots which I now understand for feeding in coco isn’t good I should have had a two gallon to allow me to feed less more often... I think? . The runoff by that I mean what I’m putting in is more of less what I’m getting out of that makes sense

When I was feeding twice a day my plants started to droop so I stoped and went back to once a day

Sounds like you're logically thinking about things; that's good. Like I said, you're not that far off. Good luck.