Your mom doesn't want to talk about the tubs because she knows she is wrong. It's very hard to admit to your kids they know more than you do. Especially with stubborn moms. I know I have one too.
Here is what I would do: Do not focus the conversation on the tubs. Obviously it is a bad subject. Focus on what is wrong with the tanks. Try this:
Mom, can you help me. I can't figure out how to get the tanks perfect. They are cold and the humidity is way low. Winter is coming, and temps lower than 75 can make them sick. RI is very serious, and can kill the collection..... Also, stumpie is going into shed. I want him to have a really good shed, and I just don't have the time to spray him 3 times a day.
Let her know you need her help. Let her mention the tubs. No matter what she comes up with, tell her why it won't work.
Honey, just use damp towels to increase the humidity. Mom, that is a breeding ground for bacteria, and they stink. You could use more pads to increase the heat. No, mom, i would have to hook each of them up to different dimmers. That's dangerous to have all those coords running.
Make her think you have thought of everything else, but you just can't make it work. Well dear, maybe we should try the tubs. Oh, mom, that is a great idea!
We all love out stubborn mom's. Sometimes they just need to feel like they are still in the game. Good luck!
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