The Houston water is extremely hard. I tried the pandas 20 years ago. Got them from an existing tank in Houston. They were already in bad shape with fin erosion. Beautiful fish that I couldn’t keep going.
Good move on getting young. Even on the regular Uaru, my luck has almost totally been on small grow out starting in a q tank.
I thought maybe I could make it work on a larger fish with no carbon, 84 degrees, Vita Chem/Garlic Guard soaked pellets.
In Houston if you don’t go RO and try buffers, the hardness/ph will bounce around and you have no chance on Altums, Pandas, Cardinals or Rams—all great fish.
Good luck on the Fernandez-they are the holy grail!