After a couple of waterings with a commercial fertilizer my girls are looking better than ever. The yellowing has subsided and the plants have gotten a nicer green color. Thanks to all who gave advice!

My two girls have for a couple of weeks been getting yellowing of the larger leaves. I've tried checking for root rot. None that i could see. I've repottet them to a larger pot(from 35 l to 60l as they both did outgrow the old pot. They have been getting fertilizer about once a week.

Can anyone help me with what im doing wrong?