I've had this plant since it was very small, about 2+ years. It grows new leaves bigger and taller than the last every other month or so. Although when new leaves grow, a smaller older one turns yellow and falls off... and now these dark dry patches are all over every leaf. I can't tell if it's over watering, under watering or something else. I water it once a week, every other week in the winter, and I put 2 white fertilizer sticks into the soil every 6 months. (Which I've done to all my plants but this is the only one with yellowing leaves) please help 😭
Images show a brand new leave that opened this week with small yellow spots already on it!