Catalina goby in a jar?

[davidcalgary29]

I've got a 4g jar at work that I built out of a beverage dispenser. Is this enough room for one Catalina Goby? I have nothing else except some macro.The unheated jar's held steady at 19-20C over the past two months.

 

[Tamberav]

I keep two in a 7g but it is kept at 56 degrees. Not sure if 68 is low enough.