Black Domina leaf starting to show spots...

[maryjanesjungle]

Hey all, i got this one leaf on my one Black Domina plant (its 3 weeks old from seed) and its just starting to show signs of spots. What do you think it is?



This is from the grow in my sig btw. I'm using distilled water and Sensi Bloom part A&B and Cal/Mag as ferts. Not enough cal/mag?

 

[stinkfinger]

your gut feeling looks to be right. I would say it looks like the very begining of a Cal-Mag def. What dose of cal-mag are you giving them and how often? I give mine 5ml per gal every watering/feeding. good luck

 

[maryjanesjungle]

your gut feeling looks to be right. I would say it looks like the very begining of a Cal-Mag def. What dose of cal-mag are you giving them and how often? I give mine 5ml per gal every watering/feeding. good luck

By your math I was a lil on the low side. I have a 35 gallon res and when I first filled it a few weeks ago I put in 125ml which is only like 3.57 ml a gallon, plus I've added about 4 gallons with no cal/mag since then so a lil less concentration as of now. I added 30ml this morning which would get me to around 155 but I'm going to add another 45ml now so I know I'm at least at your 5 ml a gallon level. From here on out ill do 5 ml per gallon added too.

Thanks man

 

[maryjanesjungle]

Just to update;..
No new spots formed after adding more cal/mag, so I guess that was the problem. But I have some new signs of my plants being unhappy I'd like some help diagnosing. pics below,...
Am I still low on the cal/mag or is it over feeding? There a month old from seed and at 600ppm (Sensi Bloom part A&B and cal/mag my only additives) from day to day reading just recently after getting up to 600ppm I saw ppm's were on the rise and pH dropping which was a first. So I'm adding nothing but cal/mag treated pH adjusted bottled water to lower ppm's as the movement tells me I was over feeding. Let me know what you think though.

 

[MynameStitch]

are you using RO water or tap?

 

[maryjanesjungle]

I started with bottled distilled water (0ppm) but have recently switched to Culligan water (about 40 ppm) tap water here is 450ppm so way way will i use it at all.