If it is a tall tank, you may want to be careful taking of the rims. The taller the tank, the higher the pressure on the glass at the bottom; the rim is more important at the bottom of the tank where the pressure is higher.
Often you will find that the rim at the top provides little structural support. Mine came off with a slight tug (while is was full of water). It certainly wasn't supporting anything. The top rim is more than anything there to a) stop you from chipping the top edge of your glass (which could lead to catastrophe) or b) cutting yourself on the unfinished edges.
Really, when it comes down to it, do you trust it? I took the risk with mine and I could not be happier.
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