1st grow, brown spots on plant plz help

so my plants are about 3 weeks old, using tap water and i am ferting. i think it might be nute burn but i would like some expert advice thx

https://www.rollitup.org/attachments/grow-journals/270422d1229389558-first-grow-hindu-kush-cfl-p1000758.jpg

bumppppppppp

Looks like a calcium or magnesium deficiency. Try CalMag and check your soil PH should be 6 to 6.5. Maybe a little Epsom Salt

im using a hydro system so.. mg and cal is caused by too low of a pH or?

No if are in a hydro system IMO it is common for a calcium for a mag deficiency if your ph is to low it can lock calcium or mg out. I have had this problem before and just used a little CalMag and raised the ph to 5.8 and it fixed it. Good Luck with your grow.

Sorry for the double post but if at all possible ditch the tap water also and get some RO (reverse osmosis filtered) water that could be what is causing you problems also

ReLiK said:

so my plants are about 3 weeks old, using tap water and i am ferting. i think it might be nute burn but i would like some expert advice thx

https://www.rollitup.org/attachments/grow-journals/270422d1229389558-first-grow-hindu-kush-cfl-p1000758.jpg

Click to expand...

Hey ReLiK - that leaf looks a lot like a couple of my plants did before I realized I had a calcium deficiency. I am using the GH Flora series nutes w/the Hardwater Micro formula. Came to find out that the Hardwater formula has less calcium in it because hard water generally has plenty (my tap water does not have plenty). I have been adding Cal-Mag to my tank for the last couple weeks and things are definitely looking better.

icic, thx for the information guys. ya its on only one of my plants but its kinda bad on that single plant. so im planning to just keep up on the pH and make sure it goes smooth from here.