Indian Almond Leaves lowers pH, does not increases pH.
What is the pH of tap water before adding to the tank?
If pH increases then it’s more likely something in the tank is increasing the pH such as the substrate, rocks or coral decor.
It’s possible that coral or substrate contains bicarbonates which is the most common factor in raising pH.
But most freshwater fish tend to do better in pH of 7 or over as that is more alkaline (below 7 is acidic).
So imho it’s better having ph at 7 rather than lower, so no bad thing unless you keep wild caught or fish that specifically needs acidic water such as discus, amazon or west African species.
As Deanasue mentions, pH can fluctuate from tap water throughout the day so it’s a good idea to test the tap water at the same sort of time as you do water change and compare to other certain times of the day. Just to see if there are differences.
Worth testing anyway and seeing if any different at all, a fast way of testing pH is to have a digital TDS meter, normally these will have a pH reader as well as TDS readings. A good quality TDS that’s calibrated is fine, loads available to buy online and not expensive.