What's with the black silicone?

NewObsession

AC Members
Aug 27, 2007
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Just curious, I;'ve noticed on the TOPFIN aquariums I see @ Petsupply places have black silicone in the joints. Is this better /worse than the usual clear 100% silicone?
 
Less room for error if sealing your own tank with black,ill have to look it up,it probably looks different
 
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