Lol thanks sorry bout that nobody answered on here for a while and with my luck answered within 24 hours of me posting a new thread.
Don't worry about it... it just makes things confusing when people are trying to follow one conversation to have it spread over two threads.
Read the article I posted and make sure you understand the concept of pH as it applies to nutrient uptake in plants. Different plants have different needs, and have evolved to flourish in different conditions - however take a look at this graphic for a general indication of what I am talking about.
If you have your citrus in acidic soil, and are watering with acidic water, it will not be unusual if you see lighter green or yellow foliage from chlorosis due to MAGNESIUM deficit.
If you live in Orange County, California, named after its citrus fields, you may experience similar-looking chlorosis due to IRON deficit from alkaline soil and alkaline water. That is why citrus growers in SoCal acidify their soil (to lower pH), while citrus growers in Florida add lime to make their soil more alkaline (to raise pH). With citrus you want to be right in the middle... slightly acidic... with a pH of perhaps 6.5 being considered optimal. Remember that pH is a logarithmic scale, and that pH 6.0 is ten times more acidic than 7.0, and pH 5.0 is
100 TIMES more acidic than 7.0. Small numerical changes in pH make a big difference as you move farther away from neutral. This is definitely a case where if "slightly acidic" is good, "very acidic" is NOT good.
I had over a dozen mature citrus trees in California, and spent a lot of time babying their soil pH because of clay alkaline soil and extremely alkaline irrigation water. Here in North Carolina I'm not even sure you can
find acidifying fertilizer - but they sell lime by the truckload.
Let me state the issue in a slightly different way to make sure people understand the problem. Due to your soil pH, you may find yourself in a situation where you have plenty of magnesium in your soil, but your tree can't access it. Adding more magnesium via additional fertilizer will not fix the problem - you have to fix the pH of your soil. If you research this issue further, you can get into the chemistry of why this is so.