You local fish stores only sell Aqua safe because theres more ££$$££ in for them by shifting more bottles.
I have just moved off aqua safe and onto API stress coat untill i get a bottle of prime.
The old version of Tetra Aqua Safe didn't detoxify the ammonia released from the chloramine unless you overdosed it. The 'new' bottle mentions that it 'eliminates' chloramines but doesn't specifically say it deals with the ammonia so I'm still a little suspicious that it doesn't (Prime does).