Thanks, Hoppy. I should know better.
This is a 58 gallon tank with a 4 x T5Ho light fixture, pressurized co2, miracle grow soil capped with black diamond, Up and running for well over 6 months now.
Things that have changed recently:
1. Started EI dosing dry ferts about a month ago and have seen a significant boost in growth.
2. Ran out of CO2 a couple of days ago and went without it for 2 days before I could refill the tank.
The problem started with the Hygrophilia and it took less than a day for all of the leaves to melt and drop off. There are none left now
The Staurogyne Repens is melting too, but not as fast. Both were looking great less than a week ago.
I did a big water change and I think it has stopped the melting, but really, I just want to understand what is happening.