The stuff you have is the "GE Silicone II"...that version has the mold/mildew retardant in there, which could be detrimental to your tank. That being said...I've heard several people say they use it without issue, but it's not worth the risk IMO.
What you want is "GE Silicone I" if you are just picking up something from the hardware store. Instead of a gold label, it has a silver label. The stuff Chad linked works as well...just a PITA to find at the store when I go and I honestly prefer to use the larger dispenser with the gun.