Tomorrow ready for 12/12 with some issues

Hello, these babies would otherwise Be ready for 12/12 Tomorrow, but The other girl has some issues. I tried Flushing and then giving The nutes but now she keeps getting Paler Evert Day. Shes still growing everyday but allthe new growth is very Pale and yellowish and wobbly like. Her sister is doing fine, both from seed, rqs strawberry cough. And have Been given same nutes. Can someone help me determine problem?

Edit. If it matters this one was topped in her childhood, her sister no.

Give them some cal/mag, and a good heavy feeding next time about 25% stronger then what's on the bottle.

Ok, cal/MAG was something i forgot and was about to add today, but The medium is too moist. Ill feed her when it has dried a little or should i ads it now anyways? Had heavy flush 2 days ago