I have a Meyer lemon that I purchased a few months ago. I potted it into a self watering container with some potting mix mixed with some peat. It's flowering and small fruit are forming but the leaves are not looking wonderfully healthy. There are yellow splotches on the new leaves, and on the old.
The temperature is in the very low 20s Celsius (60s Fahrenheit), and I've only given it some citrus fertiliser only once when I got it.
My pH meter, which I've never used before, is saying pH is about 7.6, moisture level 2/10, but when placed into water it only reads 6/10 so the whole thing may be junk. So this should be low enough to absorb manganese though looks like iron might be a marginal.
Should I try acidifying the soil with some sulfur or do something else?