Just done another set of readings and the ammonia one now reads 0.25 i think, it certainly isnt 0 like it was 2 days ago. Likewise the nitrate reading has gone down to 0 whilst nitrite has stayed the same at 0. Little confused now as from what has been said it should be a mature filter but im guessing these readings suggest otherwise.
Actually looking again the ammonia is a yellowy green which probably isnt as green as 0.25 but isnt as yellow as 0 if that makes sense. Why doesnt someone invent a digital reading instead of having to interpret these colours
What i may do is save the ammonia tube so i can test again in two days and compare colour. Dont know if that will work but if it did id be able to see if its greener.