An ammonia reading of .5 is high and how toxis it is depends on your pH and the water temp. Ammonia becomes more toxic at higher pH levels and at higher temperatures. For instance, a reading of .5 in a tank with the water pH at 6.2 and temp of 76 would be considerable less dangerous as the same reading with a pH of 7.6 and temp of 80.
For now, you should do water changes as needed to get the ammonia below .25 ppm. If that requires 2 a day, then that's what you should do. Also, you may want to cut back on feedings. Once a day is fine. I actually skip a day here and there on my tanks. Fish can easily go several weeks without being fed.
The bacteria will eventually process the ammonia and the subsequent nitrite but they have to build to numbers that can handle it first. Most bacteria multiple in very short time spans but the nitrifying bacteria that process ammonia and nitrite need anywhere from 8 to 30 hours to double so it takes while for their numbers to catch up to the waste producted by the fish.
Have you tested for nitrite or nitrate yet? If you have nitrite, then at least some ammonia is being processed and a climbing nitrate level indicates that ammonia AND nitrite are being processed.
Finding media is difficult. Thepinned topic hasn't been kept up to date very well and a lot of the names on it aren't active any more. You can try a threadand just put in it that you know the pinned one exists but that you didn't find anyone near you on it.