When you test for ammonia with an API test kit the result you get is an ammonia plus ammonium combined value. Also when using Prime with a salicylate based kit (as API and most kits are) you should take the reading right away after you do the water change for more accurate results. I recommend you get either a Seachem Ammonia Alert or a Seachem Multi Test Ammonia kit. Either will give you a true ammonia reading and not an ammonia plus ammonium reading. You can add extra Prime per the bottle instructions but until you get one of the Seachem products I mentioned you will not be getting a true ammonia only reading. What is the exact name of the ammonia remover product you mention? Don't be sorry for asking questions. That is what this forum is here for. Many of us (myself included) started out asking the same questions as you.