I think your ammonia is closer to 0, or at least I wouldn't worry about that color (it's never truly 0 in a tank). It never seems to be as yellow as 0 is on the card. The saltwater one is even worse. Everyone who uses it for the first time will report .25 ammonia in their reef tanks with thriving corals! If you are concerned you could check it against a blank such as distilled water or a lightly-stocked, well-established tank.
Glad to hear he's improving!
Glad to hear he's improving!
