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Rimless tanks come with thicker glass which provides additional support. On rimmed tanks the rim provides the extra support.
Taking the rim off of a rimmed tank poses a risk of the tank coming apart at the seams. It's been done on small tanks (10g) but I'm not sure of tanks larger than that.
Taking the rim off of a rimmed tank poses a risk of the tank coming apart at the seams. It's been done on small tanks (10g) but I'm not sure of tanks larger than that.