First, do not add more fish until the tank is cycled. If you read the link iamntbatman gave you will see this takes a few weeks. Until then, the bacteria have not multiplied sufficient to handle the ammonia the present fish produce, and adding another fish will only increase the ammonia (fish produce a lot of ammonia) and lead to stressed fish and probably more deaths.
Second, twice a day feeding is not necessary; once a day, preferably in the morning (fish are generally more active then) and only what they clean up in a few minutes. One or two flakes is sufficient nourishment for a fish each day, so don't keep feeding just because they seem hungry; fish have a natural instinct to eat when they find food. A hungry fish is a healthy fish.
Third, the pH is not a problem for the fish you have. It is the ammonia and nitrite that are toxic, and the cycling has to run its course. Daily water changes of 50% to keep ammonia below .25 and nitrite below .25 when it starts to spike are fine; use a good declorinator--one that detoxifies ammonia as well as chlorine, chloramine and heavy metals is a good idea; some like Prime also detoxify nitrite.
Lastly--you are not a pain.
Keep asking questions, and keep us posted. We are here to offer help, we have all gone through these cycling issues.
And welcome to Tropical Fish Keeping.