I just got my Betta the other day. I have roommates who do not want to turn on the Central Air and it gets down to 40-45 degrees at night here lately. Is this effecting the temperature of the bowl a lot or is it ok? I don't have a thermameter on the bowl. It is just a 1 gal bowl. Also, if it is altering the temp a lot will he still be ok? He seems to be doing fine over these past 2 days, so.....