hey all, im in the process on glueing a refugium myself and i came across few threads i have read here that we should only use GE I silicon and NOT GE II.. i also heard that my fish buddies told me that if we use aquarium standard silicon it's much harder then commercial grade silicon.. anyone have any incites about this?? also if i were to use GE I silicon i was thinking of getting BLACK color, would you know where to find black color silicon??