re: Per the LSU Ag Center my pond has a pH of 4.53

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I just didn't believe the pH would be that low.

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How much rain have you gotten recently? Dead or decaying leaves in the pond? Both can lower the pH.

Try taking a reading in the middle of the afternoon on a sunny day and see what you get. They should be the highest at that point of the day. The lowest pH will be first thing in the AM.

Also try testing different depths and at different locations in the pond. I'd specifically take one right where the spring enters the pond. Based on what you've posted, I'd bet the spring runs over a mineral deposit that leads to the low pH.