I have 5 10 gallon tanks with a whisper 20 on the narrow end and a 12 inch piece of cut project glass from a home storage covering most of the top but I was still losing a lot of water due to evaporation. I added another 6 inch piece of glass to completely cover most of the tank but needed a handle to lift the smaller piece up if needed. These pens are perfect for that. Evaporation is now much slower and handles make handling thin glass lids easier. The glue seems to be holding well. I recommend wiping the glass with rubbing alcohol and then gently pressing on the handle for 5-10 seconds to ensure a good grip.
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