bottom leaves turning yellow during flowering

Its been flowering for 18 days now is this normal? Im not sure but i thought i read somewhere that it will do that to push the things it needs to the main top stems.

can you take a pciture of it. so far I know its a mobile element deficiency.

which element? The picture is there you must not have logged in, click on the numbers at the end of the sentence so you can have a lookView attachment 2068052

it is happening to my 9 girls also at day 21 flowering, still did not figure out why, all i am doing is cutting the so much yellow leaves.

its ok for now but will get worse unless you make sure all feeds and waterings are 6.5. And dont underwater a healthy plant it encourages salt build up, moisture stress and yellowing.