So I have several "spare" fish tanks. Simones current tank is a 15T, I've decided it's not got enough floor space. I have decided to not use the 55 for space reasons, but I have a 37T and a 25 I could use. Which would you use?

I like the idea of building climbing space in the 37, but if she won't use it it's not realy worth it.. Unless I just wanted the hieght for decorating.

A pic of her 15.