Thanks again, everyone.
My 55g is still really cloudy tonight, which is worrying me. Plus, at the nearest lfs, the API ammonia test kits on the shelf are as old or older than the one I have at home.
Tomorrow, I'll try another store.
To answer fishorama, no, I didn't do any crazy filter cleaning. This tank has been cycled and stable for three years, with my maintenance schedule of a 50% water change per week. If for some reason my bacteria colony has died off, I'm not sure why that would happen.
I'll post back my results once I can find an up-to-date test kit.
My 55g is still really cloudy tonight, which is worrying me. Plus, at the nearest lfs, the API ammonia test kits on the shelf are as old or older than the one I have at home.
Tomorrow, I'll try another store.
To answer fishorama, no, I didn't do any crazy filter cleaning. This tank has been cycled and stable for three years, with my maintenance schedule of a 50% water change per week. If for some reason my bacteria colony has died off, I'm not sure why that would happen.
I'll post back my results once I can find an up-to-date test kit.