An ammonia level of .5 will not kill your fish.
The problem will be if it keeps rising due to the tank not being cycled. Best thing to do is transfer the ceramic media, test and keep doing water changes so it doesn't spike any higher.
Update,
still at .5 ammonia, o nitrite and 0 nitrate(day 10). I transfered ceramic media yesterday. I also talked with the people at Seachem. they stated to also dose with Prime which I started. Prime will detox the ammonia... I am feeding every other day very small amount...so far so good. also doing 10% water change every other day.