Help with indoor orange plant yellowing around leaf edges
I was just wondering if anyone might have any idea as to what is making my orange plant unhappy? As you can see from these photos, some (but not all) of the leaves are going a bit yellow, particularly towards the edges. This seems to be happening mostly on the younger leaves. There hasn't been much of a leaf drop. I'm used to the leaves being a nice, dark, glossy green and so something must be up.
The pot it's in has drainage holes and I only water when the soil is completely dry at least 2 inches down into the soil. When I do water, I normally mix in some Baby Bio Citrus.
Any idea what I should do? More water? Less water? More food? Less food? Different food?