AR is one of those plants marketed as easy and it's anything but. It requires an aqua soil and CO2 along with good strong light to do well. My advice, try it for a bit longer, but get rid of it sooner than later. If the leaves continue to randomly melt; you are allowing an ammonia source into the tank and it's going to be a source for algae. I would recommend Hygrophila corymbosa compact, It's not red, but grows similar and does well in low tech tanks. If you are looking for red or deep bronze colors that stay small, I would also recommend Crypts. There is a Crypt for every color need and placement!
"Sometimes, it's just best to invite those who enjoy the soup you are serving", AR is a picky eater!