My water bowls are 1 gallon size, so birds cannot bathe in them, though they may try sometimes! I have been leary about putting out their 11 gall. bathing tubs at anything less than 32 F. I have scovies right now. The water freezes to them and stays there, more or less. I think getting a bath at sub zero would help them feel better (I know it would), but could this hurt them, getting out of pool into 5 above or 5 below F temperature and having water freeze? Advice? Ireally wanna pull out those tubs and I know they'll just dive into them--I know it. Remember, these are scovies, with their less developed oil glands to keep feathers more waterproof........ THANKS!