I use painter's tape for all my securing needs. It is colorful, and easily removeable. If the regular painter's tape is not sticky enough, you can get extra adhesive kinds for a few dollars more. $15 in tape has secured dozens of my tanks, and not just for the T's. I also use it to tape shut the glass doors on my snake tanks, to keep heat mats stuck to tanks, for mounting thermometers, and even for making handles on a sliding glass tank door that was lacking them. Very versatile stuff, and I dont know what I would do without it.