Chilli Padi

Another plant of my chilli padi getting ripen..... I have been thinking why the leaves keep turning yellow... A friend suggested perhaps due to lack of water so I tried giving them more water.. But still the problem persists.... I chanced upon someone's online comment that chilli and tomato needs a lot of calcium so I am thinking perhaps they lack calcium! So I am going to try watering them with calcium the next few days to see if it helps!