Ok, this is probably a silly question. I have a heater I recently got for my 1.5 gallon tank. It is an Elite mini submersible 5 heater. It has a glass outside and a ceramic inside to it. When I am doing water changes I do unplug it. I wonder though, say I do a 50% water change, is there a change the glass on the heater may shatter when the water is removed? Is there anything I should do to make sure my heater does not break? thanks!