Brown leaf tips - help!

[Cap'n Cod]

Hi all
I noticed a couple of leaves with brown tips (see photo)
Last week I noticed some leaves on the 2 plants nearest the heater were beginning to claw, so I moved them after advice here & it seemed to help
The plants have been in soil for 23 days (Biobizz light mix).
I water every 2-3 days, depending on soil dryness (finger in soil method to check!)
Yesterday I gave each 1lt distilled with nutes - for the 3rd time - 1ml each of Biobizz bio-grow, acti-vera and bioheaven - so 1/2 doses.
-Anyone have any ideas?
Thanks

 

[automan2]

I'd suggest a moisture meter to check the correct spot for moisture cause finger deep does tell you much about the rootball….been growing 15 yrs and still don't trust my finger....Don't use it but think bioheaven is a bloom enhancer. You should be feeding your plant good veg stuff. Personally, I start feeding around 20 days old at 1/4 strength but only when the meter says its needed.

 

[Cap'n Cod]

I'd suggest a moisture meter to check the correct spot for moisture cause finger deep does tell you much about the rootball….been growing 15 yrs and still don't trust my finger....Don't use it but think bioheaven is a bloom enhancer. You should be feeding your plant good veg stuff. Personally, I start feeding around 20 days old at 1/4 strength but only when the meter says its needed.

Thanks automan2 - I thought biobloom & topmax are for bloom enhancement (but please correct me if I'm wrong!) . That said, yesterday was the first time with bioheaven.
But just reading around nomiw - I'm begi;ing to think even half doses are too strong.
But I'll look into a water meter - thanks

 

[Not-a-cop]

You’d probably be best to post this in the auto infirmary, make sure to read & fill out the form in that section and the good AFN people who know best will be along to help you out.
But a whole litre every 2 to 3 days sounds like a lot to me, my current crop is roughly the same age (27 days) and I am only just starting to water 500ml once per day, i handball the pot and water when it feels light. Also, Distilled water is minus some key nutrients like calcium and magnesium which could be worth looking at.
Best posting in the infirmary to be sure

 

[Cap'n Cod]

You’d probably be best to post this in the auto infirmary, make sure to read & fill out the form in that section and the good AFN people who know best will be along to help you out.
But a whole litre every 2 to 3 days sounds like a lot to me, my current crop is roughly the same age (27 days) and I am only just starting to water 500ml once per day, i handball the pot and water when it feels light. Also, Distilled water is minus some key nutrients like calcium and magnesium which could be worth looking at.
Best posting in the infirmary to be sure

Oh god the infirmary - doh! What can I say - still a newbie (just started 2nd run) . But thanks for taking the time respond.
OK I'll do as you advise - I'll post to the infirmary & see what they say.
Funnily enough I just bought some calmag online - but I only bought it to bring the order up to the free delivery threshold, lol.
Have a good one!

 

[Cap'n Cod]

PLEASE DON'T REPLY ANYONE ELSE - I'M GOING TO CHIP THIS ACROSS S TO THE INFIRMARY (where it should be!)