1ft corn in 55g tank?

[asnakenamed-oly]

I have a little snow corn named Olympia, estimated about a foot or so long and about 3-4 months old, who is starting to rub her nose on the glass of her 2.5 gallon tank. I have a 55 gallon that I originally intended to put her in, but I was told to hold off putting her in it because she was too small. I was told that I wouldn't be able to heat it correctly and that she would be intimidated by the open space. I'm currently keeping the 2.5g inside the the 55g, simply for lack of space, and I sometimes let her explore the 55, so she's pretty familiar with what's going on in the larger enclosure. So my question is, would it be okay for me to go ahead and put her in the 55?