Is this potassium deficiency

Humidity of 40% 75f growing in happy frog ph going in of 6.5 soil ph of 7 feeding at 600 ppm not sure off runoff cause evrryone keeps saying it dont matter
 
I dont check my run off every feed but atleast every other. Here's how I understand it if you feed 600 ppm right and your your not flushing or checking the ppm run off you wont know whats in the root zone. It could be 1300ppm or 1500ppm. I feed/flush every feeding to make sure what ever goes in pushes the old out. example If i feed at 750 ppm ill feed until 750 comes out no more than 100 ppms over. Hopes that helps
 
Now if you woulda feed again another 600 that woulda put you @ 1500 ppm which is more than likely causing your problem.
What I do when I feed my 7 gal. Ill feed 3 gal of nutrient solution to make sure its feed and flushed.
 
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