The dwarf gourami die really quick from dietary deficiency. My 4 dwarf gouramis that has left in my tank doesn't die anymore because i feed them every day.
I had 5 dwarf gouramis for about 2 months. I feed 5 cubes of frozen bloodworms every day. And i missed giving them food for one day, and 1 of 5 died. I think dwarf gourami eat alot of foods and can not be miss even one day.
For me would be Thai plakat jumped off the tank and live outside the tank on ground for 6 hours, when i came back i found it still alive and it was dead after 1 hour.