Why do Chalices melt??

[toyencounters]

I am new to collecting Chalices can someone explain to me reasons why a Chalice would melt??

 

[YOUNGBLOOD]

how old is ur tank we need more info on ur system do u use ro/di water tap ect...

 

[toyencounters]

Nothing is melting I would just like to know more about the melt process and why it happens?