That's what I'm working with in my backyard...Got about 8/9 koi in there including a few butterfly.
Just bought a Fluvial Edge aquariaum today. Only 6 gallons but it'll be easy to take care of and I won't have to worry about too much poop maintenance. I'll be setting it up tonight and adding some tiny/small tropical fish over this week.
It's pretty unique and stylish. It has an edgeless design which can be seen clearly from all angels. Makes it look like it's just floating. Same viewing ability from all sides including the top.