Tested some water again today:
Nitrate ~7ppm, raised to 17ppm
Phosphate 1.0ppm, didn't add any
I took most of my Endler males out and put them into a quarantine tank. They were just harrassing the few females too much. I lower the water temperature to 80F to get more female Endler.
My Echinodorus ozelot is developing a new flowering stem. It's already above the water surface, although it's not flowering yet.