What kind of glue is an aquarium sealed with?

Its actually not glue, its silicon. You can get aquarium silicon online at www.bigalsonline.com the link is:

http://www.bigalsonline.com/edealinv/servlet/ExecMacro?omni_scAdd=scAdd&nurl=control%2FBrowseCatalog.vm&eurl=control%2FBrowseCatalog.vm&rurl=control%2FBrowseCatalog.vm&ctl_nbr=3684&queryType=0&path=&offset=0&hits=12&sortby=&query=sealant

ANS 2- Any 100 % silicone will be the same as far as building an aquarium goes.