Britnee, Like we talked about in your other threads on this, it's going to take weeks to establish a nitrogen cycle in your tank and is going to be a labor intensive process given the stocking level you have in the tank. Also.. like I believe has been suggested, do you know anyone with a healthy, established tank? Or have a friendly fish store that can give you some well-used bio filtration media that you can run in your filters? This would instantly cycle your tank.
Showing 0.25ppm ammonia could be from actual ammonia being produced by the fish, it could be from your tap water (yuck), or it could be because your water supply is using chloramine as opposed to chlorine. Chloramine will give a 'false' ammonia reading when certain dechlorinators are used in combination with the API master test kit.
All you can do is continue with your water changes and wait for nitrates to appear. You may never see nitrites doing a fish-in cycle, but that's a GREAT thing. Nitrites are super toxic to fish, much more so than ammonia or nitrates.