Nitrate 5 ppm - fine. Ideally it should be kept below 20 ppm, so yours is well below that.
Nitrite zero. Good, though keep an eye on it as it may go up.
Ammonia 0.5. Not so good depending on the pH.
pH, I am confused. Usually either the pH is somewhere in the middle of one of the testers and if it's in the middle of high range is the maximum on 'standard' or in the middle of 'standard' and the lowest reading on high range. And there is an overlap region between the two where 'standard' shows the highest level and high range shows the lowest which indicates around 7.5.
However, your readings are in the middle for both, which is impossible. Could you check those readings again please.
Back to ammonia.
Ammonia is a gas which dissolves in water into two forums - ammonia and ammonium. Ammonia is toxic to fish, ammonium is a lot less toxic. Both these forms exists at the same time, and the amount in each form depends on temperature and pH, and there are calculators to work out how much is in each form.
Using one of these calculators and assuming your temperature is 77 deg F (25 deg C), at pH 7.0 the amount in the ammonia form is 0.0029 ppm and the rest ammonium, while at pH 7.8 it is 0.0176 ppm with the rest ammonium. As you can see it's 6 times higher at pH 7.8 than at pH 7.0, which is why I asked you to check them.
At the moment, both of those amounts are OK - they are both below 0.05 ppm of the ammonia form. But if ammonia of the tester reading increases, the amount in the ammonia form will also increase.
There is another aspect to ammonia, and that's chloramine. Many water providers use this to disinfect their mains water. Chloramine is ammonia and chlorine joined together. Water conditioners split chloramine into ammonia and chlorine and remove the chlorine part, leaving the ammonia part in the water. Some of these conditioners also detoxify ammonia for around 24 hours, and in a cycled tank the filter bacteria will have 'eaten' all this ammonia before it has chance to "undetoxify". In an uncycled tank, it will still be there after 24 hours and will become toxic again.
Can I suggest you test your tap water for ammonia as this will show if it has chloramine in there, which could account for your tank reading.
Nitrite zero. Good, though keep an eye on it as it may go up.
Ammonia 0.5. Not so good depending on the pH.
pH, I am confused. Usually either the pH is somewhere in the middle of one of the testers and if it's in the middle of high range is the maximum on 'standard' or in the middle of 'standard' and the lowest reading on high range. And there is an overlap region between the two where 'standard' shows the highest level and high range shows the lowest which indicates around 7.5.
However, your readings are in the middle for both, which is impossible. Could you check those readings again please.
Back to ammonia.
Ammonia is a gas which dissolves in water into two forums - ammonia and ammonium. Ammonia is toxic to fish, ammonium is a lot less toxic. Both these forms exists at the same time, and the amount in each form depends on temperature and pH, and there are calculators to work out how much is in each form.
Using one of these calculators and assuming your temperature is 77 deg F (25 deg C), at pH 7.0 the amount in the ammonia form is 0.0029 ppm and the rest ammonium, while at pH 7.8 it is 0.0176 ppm with the rest ammonium. As you can see it's 6 times higher at pH 7.8 than at pH 7.0, which is why I asked you to check them.
At the moment, both of those amounts are OK - they are both below 0.05 ppm of the ammonia form. But if ammonia of the tester reading increases, the amount in the ammonia form will also increase.
There is another aspect to ammonia, and that's chloramine. Many water providers use this to disinfect their mains water. Chloramine is ammonia and chlorine joined together. Water conditioners split chloramine into ammonia and chlorine and remove the chlorine part, leaving the ammonia part in the water. Some of these conditioners also detoxify ammonia for around 24 hours, and in a cycled tank the filter bacteria will have 'eaten' all this ammonia before it has chance to "undetoxify". In an uncycled tank, it will still be there after 24 hours and will become toxic again.
Can I suggest you test your tap water for ammonia as this will show if it has chloramine in there, which could account for your tank reading.