My Ludwigia has gone spindly. It's not light (4 wpg), so I think my KH has gotten too high. KH tested at 13 in the tank and 5 out of the tap. I've pulled the Coral out of the filter after my water change today. I think my GH is around 10 or lower, but it's hard to tell, since my test kit is fading.

CO2 is about 45, other things more or less EI.

Swords don't seem bothered by the conditions BTW.