I'm sure everyone reading the title is thinking, "Wow, why doesn't jack*** just peel it off?" Well, it's on my 5 gallon acrylic and refuses to come off. Is there anything I can use to get it off? If it was stuck to a glass tank, I'd just use a razorblade, but I don't want to scratch up the acrylic here. Btw, it's not my fault- I got the tank used... Thanks for any suggestions!