emmajt
Fish Fanatic
Maybe take a ~20ml sample to a fish store for them to test in front of you (probably be a charge of at least £1 for this), or buy another ammonia test kit (or even a strip test) to compare results against this existing API one?
Will do just to check it out properly but im pretty sure everything is fine with the test kit given that my test of ammonia and tap water came up as expected.
Silly thought, have you run a test in a bucket with the same concentration as your tank. could be your test kit that's off. I'd go for the same concentration rather than a strong one so you could compare
Good idea will do that now