That's not too big of a jump. As long as your fishes' pH preference is still being met, everything should be fine. Fish can handle small increases or decreases in most water parameters.

You can use the pH adjusters (I usually just do water changes unless the pH is a 1.0 difference or more because I like to keep my tanks as natural as possible). I would add the pH adjuster to a separate container containing the tank's water and then add that to the tank... just to be on the safe side.
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Phishie
Site Coordinator

"An ounce of prevention is worth a pound of cure."

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