Spots! Can you take a look?

Hi everyone,
I noticed these spots on my plant a couple days ago. Being an extreme newbie, it has me worried. I checked a couple nutrient/deficiency charts online with the pictures and descriptions. I am still having trouble narrowing it down between a simple ph issue or stage IV cancer.
Its a dwarf low flyer I started in rockwool and transplanted to my diy DWC bucket. The bucket is an expirament for me. I have a couple other plants growing in dirt. I have had it in the bucket for about 3 weeks. It is under a 315 CMH that sits about 24 inches above the top of the plant. My temps run in the high 70's in my 3x3 tent.
I have been using fox farm big bloom and grow big at half strength. I also added cal-mag. I have been using distilled water.
I appreciate any advice. If I left out any key info, let me know.

NRPS71 said:

Hi everyone,
I noticed these spots on my plant a couple days ago. Being an extreme newbie, it has me worried. I checked a couple nutrient/deficiency charts online with the pictures and descriptions. I am still having trouble narrowing it down between a simple ph issue or stage IV cancer.
Its a dwarf low flyer I started in rockwool and transplanted to my diy DWC bucket. The bucket is an expirament for me. I have a couple other plants growing in dirt. I have had it in the bucket for about 3 weeks. It is under a 315 CMH that sits about 24 inches above the top of the plant. My temps run in the high 70's in my 3x3 tent.
I have been using fox farm big bloom and grow big at half strength. I also added cal-mag. I have been using distilled water.
I appreciate any advice. If I left out any key info, let me know.

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this is your problem. I have seen hundreds of times. Distilled is not good for growing. If you must use it. Up the cal mag dose.

Thanks for that! I was hoping I was doing it a favor by using distilled water. Our city water here is horrible. I was going to change my water completely today. do you think I would be better off using store-bought spring water?

Also, I do not have one of those ppm testers yet. A friend came over and used his on my tap water and it was like 700ppm. Not knowing much about it, I took his advice and used distilled water with the cal-mag. I thought it would take care of it but it sounds like I didnt use enough.

NRPS71 said:

Also, I do not have one of those ppm testers yet. A friend came over and used his on my tap water and it was like 700ppm. Not knowing much about it, I took his advice and used distilled water with the cal-mag. I thought it would take care of it but it sounds like I didnt use enough.

Click to expand...

store bought drinking water is better. our soil and nutrients work on positive and negative ions. Distilled is de ionized. so when it is used, it strips away ions to replace the missing ones. usually calcium or magnesium.
I use a r/o unit. it doesn't strip the water. but makes it super clean.