I would say that was a positive. I love cats. Such curious critters. ;Cat Only issue with mollies is that they eat algae. I mean all algae. I used to not check for nitrates unless I had algae growing. But with mollies it can be super high and you would never even know it. That and they multiply like crazy. I like them though.
A con to a glass top is I seem to set things on it and then forget I did. More frozen food has spoiled this way.