What is this? pics!

I am running a dwc system under a 4 ft 8 tube t5 fixture. Just yesterday these spots showed up and now they are on another plant too. This is my first grow and have not had any big problems until now. It might be nutrient burn? I am just trying to find out for sure what it is. I am using Fox farm nutes and i have 3 ak-48 and one lemon g plant all several weeks into flowering. Please help. Thanks everyone.

almost looks like it could be PH related. How has your PH been, in the right range and steady? I have gotten spots on my leaves from PH changes before.

that is defently ph related if i have ever seen it and if it aint i be suprised if you want you could put some epsom salt in the next watering as it would hurt it just in case but i would agree with the post above me

it looks like magnesium, it could be getting locked out .. what is your ph

TrynaGroSumShyt said:

it looks like magnesium, it could be getting locked out .. what is your ph

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Alright so here is an update, I flushed last night and put 50 percent nutrients in. I woke up today and the spots had gotten worse I went to the hydro store and told the guy what the problem was, he said it sounded like magnesium. My ph has been between 5.5 - 6.0 for the whole grow. I was using fox farm nutrients (grow big and tiger bloom) and beastie bloomz. The guy at the hydro store said fox farm has a low magnesium percent (only .5%) so he recommended Humboldts Sea Mag to me. It has 1.5% magnesium. It can also be used as a foiler spray. Hopefully using this stuff will correct the problem, I'll let you guys know. thanks for the help.

Here are some pictures of my buds

Oh one more thing, I THINK my ph has been 5.5-6.0 the whole time. I don't have an digital ph meter my funds are realllll tight. I just use the chart on the back of the ph kit I bought for like 20 bucks.

I would HIGHLY recommend a digital PH meter..I lost my old one and bought this one for $30. http://cgi.ebay.com/SALE-NEW-HANNA-HI98107-98107-PH-METER-TESTER-CHECKER_W0QQitemZ310174329183QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4837d4a95f It works great and takes a lot of the guess work out. An out of whack PH can affect plants very quickly. It may seem like you can go without it, but once you run into a PH problem, you will wish you had one.

brewski29 said:

Oh one more thing, I THINK my ph has been 5.5-6.0 the whole time. I don't have an digital ph meter my funds are realllll tight. I just use the chart on the back of the ph kit I bought for like 20 bucks.

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If you Ph your water after adding the nutes as you should. Then the liquid test are not worth a thing, especially with FF nutes. I like FF dont get me wrong. But Tiger Bloom especially will drop the ph of a gallon of water too the low 4s in no time. Also if you are using R/O water and not using big bloom in conjunction with TB and BB then your def low on cal and mg.

if ur growing in soil .. that ph is too low.