I should be ok but I would get a small heater.
bathroom? i dunno the setup of ur place, but bathroom wont work.Lights will heat the tank and heat your bathroom. Cost to run = Not that much.
My bathroom has two tanks in it. The lights are on more then 14 hours a day.
Keeps it warm inside. Rather nice.
50 degrees=minimal if no growth.
Yea that is accurate, I was commenting more on having successful growth verse death. Good point!72 degrees is not the minimal temperature for anubias plants.
Do not believe everything you read in a book.
They will survive provided that there are still nutrients and light in lower temperatures, there just won't be any growth.
Likewise, most plants will survive the cold but will die off in frost/freezing water.
50 degrees is not freezing.
I had anubias plants chilling out all winter in a cold tank last year. Unheated room.
No issues. No growth though.
70-80 degree temperature provides good growing. That is all.