If i could only keep one kind of fish? I'd want somthing that gets big,that comes in a endless variety of patterns and colors,You can keep a group of,and will eat out of your hand.That would be KOI!!!
If I had a gun to my head and had to absolutely choooooooose it would be my clown knife of course. I love them because they are such graceful swimmers and awsome to watch at feeding time.
Caquetaia, aka, basketmouth cichlid. Awesome fish, great personalities, HUGE mouths, you'd be surprised what they can fit in there. I've lost plenty of fish I thought were WAY too big to get eaten