Will NOT fit all standard sized aquariums. I'm sure it will work great for Aqueon aquariums But by looking at other reviews it's safe to say it won't fit in a Top Fin aquarium.I have a Top Fin 29G tank and it was about a half inch longer.Go to Home Depot and snap Get a glass cutting tool (I found one for $3. Watch a YouTube video or two to get an idea of what you're going to do. Measure how much you need to remove, cut with a tool Score the glass and using a pair of fairly wide pliers, gently break the glass at the notch (watch a YouTube video of cutting the glass strips to get a better idea to get). It took no more than 30 minutes, and I had never used a tool to cut (rather, fold) glass before. If you also need to cut a thick strip of plastic down the middle, I heated a single-edged blade to red with a blowtorch and cut right away. It's a quick fix and unless you have glass cutting experience it doesn't look professional, but it's better than looking for a generic lid to fit Top Fin brand aquariums (small chance).
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