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There are many things that naturally make the water acidic, bogwood and peat do work well, but fish respirating makes the water more acidic.
Don't worry it should become naturally acidic over time.
By the way pH 8.3 is high alkalinity not acidity.
Not to pick nits, but the term alkalinity refers to KH and buffering capacity. Water which has a pH above 7.0 is referred to as being alkaline. While the two words are similar, they do not refer to the same things.
So Aqua Tom really meant to say that pH 8.3 is alkaline not acid