Hello.. I'm a new betta owner, I've never had one before in my life, so I'm not really sure about a lot of things. I know bettas should be kept in warm water, and the temperature I just took of my water was 66 degrees fahrenheit.. I really, honestly, cannot afford to get a heater for my little fish, so what should I do? I have a halogen light on my desk that I could shine on his bowl, but I can't leave it on all the time.. Is it better to let it warm up when I can and then turn it off, or keep the temperature colder, but constant? Also, I've only had my betta for... 7-ish hours now, and there's a bit of white stuff floating about in the water that I believe was in the water when I got him.. is this fungus? :'( Because I don't know what to do if it is.. change his water? Also x2, (Sorry.. I'm new..) Would it help to add a bit of salt to the betta's water? I don't have the special salt, but I have regular salt and sea salt.. If so, how much should I add? The bowl is not that big..