First grow in hydro and my first problem

[Pirate Farmer]

So i have been growing in soil for a few years, but wanted to try my hand at hydro. So i planted some clones and they rooted well, but about 6 days into the grow my first problem popped up.

I have been seeing yellowing starting from the stem moving up to the tips of the leaves. Picture 3 and 10 are the ones i am really worried about, there is browning starting from the middle of the leaf close to the stem. No idea what caused that, but the rest of the plant seems to be suffering as well. None of the others look as bad as that one. They are all hooked up to the same reservoir and i am monitoring PH, Temp, and EC levels.
8 plants in total, 6 Indica (the shody looking ones, i blame crappy clones) and 2 Sativa.

Ec is 1.58 PH is holding at 5.8 and temp stays around 70 give or take a few

First go in hydro! any help is appreciated!

 

[Pirate Farmer]

just re calibrated my meter, and all the previous measurements are true

 

[Pirate Farmer]

Could it be a mg def? my ph has been fine the whole time and im using the recommended nutes, so im not to sure.

 

[BigDog]

Looks like a mg deficiency. Try adding a 1/4tsp of Epsom Salts per gallon of water.

 

[WizHigh]

Hey Pirate Farmer welcome to 420, I didnt look at the picture but from the yellowing and brown spotting sounds like calcium & magnesium deficiency. What water are you using in your res?

You have to upload the picture to the forum correctly. Click the camera icon while your making your post and click on the picture you want us to see.

 

[Cultivator]

what is ppm of ur tap water? do u have air stones in res? what method are u using to grow? what nutes are u using and at what strength?