I noticed yellowing on some leaves what is the cause of it so I can fix before it gets worse?
Manganese deficiency, msharifi. Apply a good micronutrient product as I've suggested before. You can use Gro More Citrus Grower's Blend and apply to the leaves, which circumvents our soil issues. Or, as weather warms you can apply a micronutrient product (like FST) to the soil. You will also want to fertilize as well with a good citrus fertilizer that contains micronutrients.