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				 Black rim on top of tank.  How important is it? 
 Ive read some mixed feelings on how important the top black rim is on a tank.
 I'm about to buy a 180g and it has a crack in the middle of the top black rim so its kinda freaking me out.
 
 Should i be replacing it?  who sells it?
 
 Sorry guys if this has already been answered but I didnt find a good thread on it.
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