Have you considered making it a shrimp tank? Red cherry shrimp will breed at that temperature and do not need a filter. They're very tough little guys and will look very nice. They're so entertaining! I've done set ups like that before with 5g tanks to hold plant clippings.
Yep I've been thinking about it, only thing putting me off is that I have a small 1ft cube currently without livestock and was planning on adding cherry shrimp to that, don't really want two tanks with just shrimp.