No, not necessarily. There are two kinds of ammonia tests. If you have the kind that turns yellow to green, it's accurate with Amquel. If so, you may have more ammonia than the Amquel you put in could handle. A certain dose handles a certain amount of ammonia, so if you have mroe ammonia, you need more Amquel+.
If you have the other kind (I can never remember that color), it will measure ammonia that is even bound up by Amquel, so you won't get an accurate measure of what the fish are going through.
Good to hear the clowns have perked up! Don't neglect the water changes even with the Amquel, until the tank stablizes on it's own.