I'm currently using tanks for my 2 (planning to switch to PVC when they get upgraded), and they work alright for me. It's a bit more difficult to hold humidity and heat, especially in the winter, but it's not impossible with some tinkering! Although, I do wish I had just gotten a rack to start with.
Edit- I put my spinnerblast into a 20 gallon long when I first got her. She was about 2 months old. I covered all of the sides, except for a small window on front and put crumbled paper in. I also added a branch and fake plants to make it more crowded. After she ate a few times, I started removing the crumpled paper and the paper that was covering the glass one at a time. Not saying it will work for you, but I personally haven't had any problems.
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Thank you! I'll be getting mine younger than two months, as soon as he/she hits 100 grams and is on a proper feeding schedule. Thank you for the info!