Hello. I am trying my hand at a tank with great stuff, coco fiber, and need the recommended silicone for the job. Everywhere I've seen it says use GE Silicone II in Black color for Doors and Windows without the "bioSeal" mold and mildew resistance. Trouble is, I've checked six different places (Walmart, Target, Home Depot, Lowe's, and two True Value hardware stores) and even when I can find black, it all has the "BioSeal" stuff. I'm not sure they even make it without that in it anymore. Is there an alternative in black or any suggestions? Any help would be appreciated.