pH Up and pH Down products are great for the manufacturers and retailers but terrible for your fish.
As W1ngz points out, its effect is temporary, and it will naturally revert back, forcing you to add more, which will then go back again. This creates a vicious yo-yoing effect and is far more harmful to the fish than an ill-suited, but stable pH. That said, it is best to base your fish choices on your natural water, unless you are willing to completely restructure your entire water chemistry, using RO/DI water. This is NOT recommended for beginners, as it takes a very careful understanding of water chemistry, patience to ensure that you understand how to change the chemistry and to ensure that you are doing it properly.
If you are struggling to learn all the details of fishless cycling, manipulating water parameters is not a viable option. There are many beautiful fish for high pH. The thing that really limits your stocking options is the size of the tank. A 5 gallon tank is not suitable for most species. There are a few that would be suitable, and are ok at higher pH values.
A single male domestic betta splendens would be just fine in a 5 gallon tank, with a pH as high as 8.0.