In a 3 gallon I don't think it will make much of a difference. There will only be like 20lbs of weight on it. For piece of mind you may want to put some rigid foam or something similar underneath.
My CadLight 125g came with a foam mat that looks and feels just like what I used on my 25g frag tank and 65g shallow reef. That is a yoga mat. It's soft enough and easy to cut.
But unless the 3g tank is very thin glass, I don't think you need to worry about it.
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