Even with today's ultra-strong tank designs, glass is glass, and it will shatter if dropped, resulting in a mess, liquid loss, and a vape that is useless. Take a suitably sized band, wrap it around your tank, and set it aside. The vape band will protrude around 1.5 mm from the glass of your tank, forming a shock-absorbing rubber bumper.
There are two ways of increasing the volume of your tank.
1) You can purchase bubble glass such as Cleito Fat Boy which can increase your tank by up to 3ml's.
2) Some tanks can utilise extension kits such as the Nautiulus X or TFV8 Baby Adaptor. These are chimney adaptors which can either allow you to use a taller glass or use smaller coils.
In most cases, yes. Changing the mouthpiece is one of the easiest ways to personalise your device. Mouthpieces can be purchased in a range of sizes and colour.
In some cases, no. Some tanks such as the Aspire Nautilus have the retaining base available for separate purchase.