Hi, I'm new to the forum, but not technically to Betta keeping, I've had my Betta's Ying and Yang (male veiltales, one chocolate the other cellophane) for about a year now. I saved them back in highschool when some girl was giving her friends Betta's in these tiny vases as Christmas gifts and two people in my class intended just to flush them down the toliet, so I took them instead. I did do research back in the day, I have them in nice set up's, five gallons, lots of silk plants and hiding places, what I've never gotten for some reason is heaters, for some reason just never got around to buying them even though I know there supposed too have them -.- and I had decided it's about time I freaking get some.
So I went to petsmart to check them out, and there was this woman there looking at fish supplies as well. We started talking and she mentioned she had a few Betta's, which I told her I had Betta's as well and was actually looking at the heaters for them. She asked me how long I had them and when I replied a little over a year, she looked absolutley aghast and told me I should not get them heaters after so long. She told me that by now they are used to room temperture/colder water and that giving them heated water, even if acclimating them to it, would harm/kill them because they've lived so long without warm water. She said since they've done well in colder waters, they should do perfectly well from now on and that she had a few Betta's die because she had them for so long in "cold" water and bought them heaters and the heat killed them.
I usually don't make it a habit of listening to random people in pet stores (I have two lizards and hamsters, and Ive been given so much bad advice from people about them ><) but she seemed so very adamant that I got freaked out and now I'm not sure if I should buy heaters or not. I'm very attached to Ying and Yang, I would absolutley die if I killed them with some stupid mistake. They have been doing exceptionally well in the year I've had them without heaters, they are both very active, but I've read so many times that they really should have heaters. So, now I'm paranoid and very confused. Can anyone give me some advice?