Help!

[Parker]

My Damsel passed away somewhere around 36 hours ago I'm guessing.. I only noticed about 8 hours ago when my two clowns where lying in the sand but alive. I pulled the deceased Damsel out did a 50 percent water change and started to pray. This was eight hours ago.

I just got home from work and one clown seems to be doing better but the other is still lying in the sand for the most part. They are both taking food. I did another partial water change..bringing me up to 75% total today. Is there hope for recovery or should I maybe do the humane thing and euthanize her? When I went to bed at 11:00 last night both clowns were active and seemed in good heath.

I have no idea what caused the damsel to pass, my Nitrate was up around 10 ppm this moring, I'm not sure if this was due to it's passing or the cause of it passing.