The day might come, one day six years from now, where symptoms match the api / Red Sea test kits, just not from any thread anyone here can find from the past. That’s key in my opinion, that this is not a seneye test read panic.
*I do believe there are instances of water bacteria not working after ten days in a stocked, fed and running and perfectly normal looking reef tank it’s just that none of us can determine that off posts like this one here, or others like it:
Okay 2 to 3 days ago everything was fine, normal tank. First sign something was up was my tank got cloudy for about a day, fish seemed lethargic and unwilling to eat. I ran my test and right away I noticed The Ammonia was as high as the test could read, I didn't believe it so I checked my other...
www.reef2reef.com
Who here believes that a nine month reef, fully stocked, highly sensitive starfish in tow, no losses, plants in the display, chock full of rocks cured with coralline was truly at 8ppm? Answer: everyone does

if a test kit says it, we agree without any confirmation steps requested whatsoever.
Guess how many symptomless 8ppm ammonia alter threads there are: hundreds
Guess how many seneye owners post ammonia noncontrol in a reef tank after day ten? None
That means something.