My suggestion would be to cut a piece of plexiglass to cover any open holes large enough for her to stick her head in. Some of the larger Walmarts carry a canopy that sits over your lights and completly encloses it or you can build one. I built custom tops for my large tanks in order to run 4 4ft bulbs above them to allow me to keep plants with higher light requirements. In order to prevent them from climbing the shades from the back, I have cut off access from both ends with plexiglass cut to fill the gap between the tank and wall that is as tall as the tank top. I also covered the decorative holes that are under my cabinets to prevent them from going under it. I wanted to make sure they could not get inside since I keep chemicals under one of them (in glass canning jars just in case) to make my own plant food. I admit I would worry a bit about them drinking the water since we remove the chlorine from aquarium water, and even city water is allowed to have a certian amount of contaminants (which is why our city water statement recommends that infants, and those with compromised immune systems not drink city water). Once we remove the chlorine anything that is in it can grow. On a aquarium forum I belong to a few months ago a topic was brought up about a cat that loved to drink the tank water and ended up with giardia several times. Eventually they figured out where it was coming from.
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