hello; I think this is true to some degree. I was somewhat amazed when I got decent internet access back in 2010 and found fish forums such as this one. While I cannot be sure what affect doing monthly and later bi-weekly WC had on the health of my fish over time, I can say that now doing weekly (mostly) WC has not had a dramatic effect in the apparent condition or the longevity of my fish. Of course it has only been six years. I did mention that I pretty much always have live plants in a tank.
Hello; These are sound suggestions.
hello; reducing the number of tanks may be worth consideration. It may be something you will face anyway if the drought persists. It will reduce the need for water right away and also will show that you are using mature judgment. This may pay off in that the parental units might appreciate your willingness to help out early in a crisis. Might make it less likely you will have to shut down more or all the tanks later.