Micro grow in computer case with "heads" bagseed

I have been growing since mid/late February. Lightbulb is 27watt, 2700k. I want to add a second light bulb this one is fairly hot, and I think using 2 lightbulbs killed my last attempt so my goal is just to get something to harvest this time and then I will worry about the time it takes to grow later (unless I can fix my heat issues)

PH is 6.75 according to the pHion test strips I got which are meant for use with urine so I am not sure if that is 100% accurate.


I am a bit worried about the yellowing and browning on my lower leafs. It has been happening for 3-4 days. Suggestions and comments are always welcome here!
 
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