@emma_cogdev Thank you. The thermostat works, and we have a thermometer just on the inside of the glass so I'm certain the temperature has been stable. No cleaning has been done today, but someone did come and clean yesterday (a company, but we don't know the individual). I hadn't thought about cleaning products.
@helenczerski @emma_cogdev My husband has never let me forget that I killed his fish when we first married. Accidentally of course. I tried to wipe the side of the aquarium down, and erm, there was clearly more than just water on the sponge. :(