in my case it was a tall glass of milk .. and dad didn't notice till morning. It was a Discuss tank , total wipe.
first tank crash at 4 go me ...
How things work out , I hope for the best. I didnt mean to make lite of this , just a strange thing to here. haven't hear about anyone else it in 30 somthing years.
check all your water parameters, check all inhabitants for any signs of stress.....your new Euphillia ( Golden Froggie) are great indicators of water quality..if thats all closed up then there is a problem, but I would run carbon 24/7, watch the skimmer, it may either go flat or overflow...then do a 10% water change...you'll be fine..milk isn't toxic