Ammo-Lock is the worst thing you can use. First of all, dealing with saltwater, the purity of the water needs to be at 200%. Using RO/DI water is always highly recommended. Then again, I hear some people say, well I dont' want to invest in a high priced ticket item. Well my response is that, you either save a little now and pay it 3x later, or just spend the extra buck now and save yourself some time, money and heartache because your bad water causes stress on fish, and stress we all know can easily lead to ick.
Some fish are SO delicate that you even look at them in the wrong way they will break out in ick (a bit of a stretch but you know what I mean, the Hippo Tang for example). Since the fish can come under ich that easily, you want to eliminate all other factors you can control.
I have done tests on many of these so called "AMMON. REMOVERS". I tested Ammon-Lock, Prime, Novaqua, Amquel and Stress Coat just to see what all the fuss was about...
The conclusion is that, if you had to use a chemical, then PRIME by Sea Chem is the best choice. It elimates 95% of the Ammon. if you use double dosage. The rest of the products do very little even with double dosage. It's not worth the time and money, if you must use a product, go with PRIME.