Guys,
I would like to seek your comments on aquarium heaters. My girlfriend's tank is located inside her bedroom, the problem is during day time when their is no air conditioning, the temp is around 24 to 27 degrees but during the night her temp will go down until 17degrees cel. I think that is the major reason why some of her fish die. Is it okay to put an aquarium heater and set it to 24 degrees? For those who are using this kindly give me some advice. Thanks.