05-11-2013, 08:15 PM
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I would suggest switching from the ammo lock and the conditioner to prime. Given what you have said so far I would expect the many changes caused an initial ammonia spike. The ammo lock in my opinion is what is causing the problem here. It is know for sometimes giving elevated false readings especially with the API test kit. It will likely take a couple water changes to get it out of the tank to where it isn't affecting readings.
Quick way to test would be to take an ammonia reading then do an 80% water change. Add the ammo lock and conditioner you have been using then test ~30 minuets later. If there isn't a significant drop from the water change its likely getting a false positive. This doesn't rule out that your tank doesn't have an ammonia problem its just going to be difficult to determine if the ammo lock is messing with the results. Given you have no nitrite I wouldn't be surprised if you have little to no ammonia actually present.