When I first started keeping fish 3 years ago, my beginner book "Freshwater Aquariums-Animal Planet" by D. Boruchowitz talked alot about yo-yo loaches and I searched all over Delaware for them and they were never to be found. Last night I'm at Petco and what do I see, but a yo-yo! I said I'll take them-there was only one. It's totally cool, but the poor thing is alone in a tank loaded with cories! I'm feeling guilty, but it is definitely one of coolest fish I have ever owned!