Thanks for the compliments, aunt kymmie. However, looking great is not equal to doing great, especially in my case.
I lost another one of them two days ago. My ammonia readings have gone down and because of the nitrite spike, my fish got stressed and one of them got what I suspected to be mouth rot. It happened very fast. It lost appetite one day and the next day, it was already lying weakly on the bottom. I separated it immediately and gave it a salt dip but it didn't last more than a few hours. It died with some white thing on its mouth and face, like the skin was peeling off.
The rest of the fish seem to be okay but I continue to observe them closely, just in case anything weird happens. I'm expecting ich next since I saw one of the fish occasionally rubbing against a plant, and will be treating once I see spots on any the fish. Problem with my pond is that it's very hard to observe the fish up close unlike in a tank. I try dipping my head with my face quite near the water (it looks like I'm drinking out of the pond) but the fish just dart away. I don't want to net them yet since I might stress them out more.
If it goes past a week without spots showing up, then I guess it's safe, since I've read ich only has a life cycle of 4 or 5 days. Anyone can verify this?
I've learned my lesson and will now go fishless cycling the next time I set up a tank/pond.
Like they say, expect the best but prepare for the worst.