300 watt led indoor grow problems

Hey guys this is my first grow and I have some post on the grow journal I posted back in April and May of this year. I was having problems with my leaves turning yellow and light green. I was able to fix it and the plant took off from there and was lush green and healthy looking. I recently clipped some clones off the plant and it's been a week now and the plant the upper plant leaves are turning yellow and crisp at the leaf tips and the top of the plants leaves are very light green. It all started a about 3 days after I clipped 3 clones off of her. Not many at all. She is 17 inches tall and she looked healthy until I did that. I fed her super thrive because I heard people doing that before they cut clones off a plant. I only fed her 2 drops of st to 8 oz of water as stated on the super thrive bottle. Always the light is a 300 watt led at 18 inches away and i also noticed i saw a little tan thin bug not sure what it is. I water her when she needs it which is every 4 to 5 days which i also use a moister meter. I feed her jobes organic granular 4-4-4. Here are some pics. Could it be nute
Burn or heat stress. It stays a out 80 to 85 degrees in grow cabinet with one 40 mm intake fan and 2 40 mm exhaust fan.
 

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