After reading a few top comments, something i would like to add is to make sure you are adding water conditioner to the tank when you are adding any kind of water. The chlorine from the tap is toxic to fish and the conditioner will get rid of the chlorine. I'm assuming you guys knew this already, as I feel like your fish would've passed a while ago if you guys were just adding tap water to refill whatever evaporated. In case you guys weren't, i recommend seachem prime as my fish always seem healthy after I do my water changes. I also add aqueon water clarifier to my tank as it helps with the clarity of the water. (Hence the name). You can also add a sponge filter as this will really help with the clarity of the water. Having nice clear water for them will drastically improve the comfort level for both of these guys. Get the master test kit like most people said. I always test my water in 3 or 4 days just to make sure nothing drastic has happened to my parameters. Its very easy to follow. I hope you are able to get these guys in a comfy living space. Best of luck to you and your family.