Interestingly enough, it has. I asked my wife just to see if by chance she used Febreze in our living room recently and it turns out she sprayed our couches and carpet the morning of the day my ammonia tested high. This could be it!?
@Lasse @brandon429
I am not sure what this contains. But a general advise is not to use any chemical products around an aquarium, especially those with skimmers. Any chance she used it because your cat pee in the couch?
Sincerely Lasse