Brown/yellow stain on tank silicon

karina97

Non-member
I'm getting ready to set up a 93 gallon cube tank. Ive noticed that there's done brown/ yellowish discoloration on the silicon? Is it safe to use this tank? ImageUploadedByTapatalk1374206554.999225.jpgImageUploadedByTapatalk1374206590.295349.jpg
 
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