Use Prime..period.
RO is needed when you have the ability to pre-mix your water for a tank to attain certain parameters ahead of time. Not be a guess or used as the sole source of water and ruin buffer capabilities. In most cases with FW fish the swing is the issue vice a specific level.
If using Prime, you don't really need a chlorine/chloramine test kit.
And, depending on your test kit, they measure different forms of ammonia and its forms, so you could indicate ammonia but not necessarily bad...and it could be dependent on your pH to boot.
RO is needed when you have the ability to pre-mix your water for a tank to attain certain parameters ahead of time. Not be a guess or used as the sole source of water and ruin buffer capabilities. In most cases with FW fish the swing is the issue vice a specific level.
If using Prime, you don't really need a chlorine/chloramine test kit.
And, depending on your test kit, they measure different forms of ammonia and its forms, so you could indicate ammonia but not necessarily bad...and it could be dependent on your pH to boot.