I'm in the process of painting a tank with regular Rustoleum gloss black.
Here's some tips from my experience:
1. Make sure the glass is clean! Wipe it down with paint thinner and make sure it's clean and dry before painting. I had some patches that crinkled because of something on the glass. Took me a couple hours of scrubbing with steel wool and paint thinner to remove the bad spots.
2. Lay your first coat on really thin. Glass is pretty smooth, so there's nothing for the paint to really latch onto. It's really easy to get runs.
3. Scuff the paint with extra fine steel wool and wipe down with paint thinner between coats. Scuffing will give the paint some tooth for the next coat to grab and wiping down will remove all the dust and dirt.
4. If you do get a bad spot that you want to remove, extra fine steel wool will cut through the paint without scratching the glass. It takes some elbow grease, but it works.