I've used command hooks to mount a T8 Zilla Slimline fixture. There are holes on the side you can use to hang them from the command hooks but I found it to be wobbly and stopped using them.
Does your tank have a solid top? Did the fixture come with clips to use to hang it from a wire? If you take the bulb out there may be screw holes you can use to screw it to a solid top as well. I'm not familiar with that fixture so I'm not sure exactly what's available with it.