Newbie here, please help!

[Jeremy D Van Dyke]

-Problem: Yellow spotting starting on leaves
-Medium/grow method: soil, miracle grow premium potting soil
-Feed and supplements used: Jack's classic tomato feed 12-15-30
-Water source: ph correct tap water
-Strain and age: Big Amnesia Haze 26 days
-Climate: 18-6 light schedule, 75-80 deg farenheit
- Light used: ROhs 1000 watt led light
-Additional info: started plants on nutes a week ago, everything looked great till today! Opened the tent to find yellow spotting on some of the lower leaves. Watering schedule seems fine, thi is possible nute problem??

--Pictures

 

[Mr Green Fingers]

Looks like you need to start adding cal-mag to your feeds, I would also get some cannabis specific nutrients, with mega crop being so cheap and an all in one there is no need to be feeding tomato ferts IMO

 

[Jeremy D Van Dyke]

Thanks! I'll give it a shot!

 

[Waira]

- part of the problem is that MG soil, I often see folks with troubles using their soils in here; IMO it's not to be trusted for general quality, and might be a bit hot with the time release nutes.... this can be a problem when you add other feeds, and also the soil itself is not a complete source of needed nutrients, so if you feed to try and compensate you risk burning/toxicity...
Symptoms are kinda odd,... Ca defc. usually doesn't cause that much distortion,....
....nutes, not the best ratio of NPK for cannabis as noted,.... what's the dosage used?

 

[Jeremy D Van Dyke]

Waira, thanks for the reply. I have definitely figured out the MG is not the soil to use, I've heard great thi gs about biobuzz soils so I'll give that a shot next ti.e and switched my nutes to Mega crop. I cut the current dosage in half to compensate for nutes already in soil and they look a lot better...BTW since you on here what is your opinion on topping 3-4 week autos?

 

[Waira]

good on the nute change,.... are you in EU? biobizz soil is fine, light mix is generally best, All mix is pretty hot, not for seedlings....
Topping is fine, but consider the expected finish time for her, how soon she will go into bloom,... you want about 10days- couple weeks of veg' to get the best out of a topping, and only on larger vigorous plants, otherwise, it won't really be worth it,... lots of folks here do topping, so check around for them as research.....