Unintentional Trimless tank, Should I worry?

[Brent F]

Plastic trim is a cost saving way for tank manufacturers to avoid having to polish the top edge of the glass. A strip of plactic can hide a lot of chips and flaws in the glass.

Some people don't like being able to see the water surface and the rim can hide that. A practical use of trim is to provide a lip for a glass top to sit on.