please help!!! I need u guys!!!! lol

Ok so heres my story..this is my 5th first time trying. Im using the aerogarden...I have it on 18hrs light im using tap water filtered through a brita bc that seems to have lowest ph...my ph is around 6..it was closer to 7 but I changed the water in the tank when I noticed my green plant turning lighter green and now im starting to see yellow and brown (see photo) also I was using 1/4 dose od miracle grow which is listed at 24-8-16.. I know I know im an idiot and need to switch to something with lower nitrogen...well since I replaced the water ive had it on no nutrients..Its been 24 hrs since ive lowered the ph and flushed all the nutrients and it has gotten better...this always happens 3 or 4 weeks in...can it b saved? Take a look and please tell me what you think...thanks

its because your using miracle grow

hell it's because you're using an aerogarden, lose that thing.

how do you monitor ph in that thing? the res is too small and will not hold ph and probably get hot as hell.

more than likely its a combination of things but mostly ph. veg plants like a lower ph, 5.5-5.7. this allows them to absorb more of the elements they need more of at that stage.