A customer has a question and I hope we can get some opinions on it, thanks
“I have just cropped my first successful grow. I purchased a growtent, lighting and your product and I was over the moon that everything was going along well. I used top quality compost (one that contained bat droppings), but after about six weeks the leaves on 4 plants started to turn yellow. I read in your growguide that this was a nutrient deficiency but decided to carry on with the grow. Any advice on how to overcome this in my next grow as the yield was much less than i expected. What do I need to buy? Thanks for your help (in advance)”
I good place to start wouldn’t be a PH tester so they can text the PH level of the water they use and also the runoff water so that they can be sure there root zone is at the correct PH level. Having the correct PH levels for the medium they are using is a huge step in the right direction for a successful grow. That’s where I would start.
Join the forum and get feedback through entire grow by starting a journal with a broad knowledge base and lots of ready and willing advisors 
Welcome to the friendliest Medical Marijuana support site on the W3 
Yeah. 
Exactly. When you get here; We have a support ticket designed to help you give us information to in turn provide you with an informed answer.
Look forward to seeing you around soon. lw
After rereading your email, I realized that we have an onsite buyers guide to products available from Amazon, and the ILGM shop, to help guide you to proven products that we all use. Have a great day.