The Aerobika melted?
I was wondering about that happening.
Do we put Aerobika in before the water boils or after the water boils.
I don't sterilize my nebulizer cups.
Soak them in hot soapy water then in vinegar every couple weeks.

There are nebulizer cups which are meant to be boiled and those that can not. Try checking the info from the manufacture that comes with your equipment to see if they give instructions for disinfecting as well as just initial cleaning after use.