Buy the glass top made by perfecto. Take it to a glass shop and have them cut it to size. Problem solved. You won't find a standard glass top to fit a 75 gallon Top Fin aquarium.I am also having the same problem with my 75 gallon. I live in CT and have been to every pet/fish store in the area and cannot find glass tops for my tank. I think I'm just going to have a hardware store cut some acrylic for me and make a top out of that. I was hoping this thread would give me a place to buy the real thing lol. Good luck!