I finally got the parameters right. My NO3 was way too high, and PO4 wouldn't get a little bit up. I did several water changes and let everything settle.

The candy blue coral had a hard time. I replaced it, and it looks like it's getting better.

But one of the corals, I think, has given birth, lol. The other ones are looking great too. I hope the candy cane will get the colors back that it had.🤞🏾