Nautilus 2 tank

I have recently bought a Nautilus 2 tank,and noticed firstly that the coil in it has not lasted very long,having used it about 4/5 times since I bought it,the coil needs replacing already,having said that I cannot get the glass off in order to replace the coil,so any advice or info most helpful ,as I have bought new coils but don't want to be running back to the shop just to change the coil ,many thanks
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