Last week I got a halfmoon at Petsmart. I fell in love with him the instant I saw him. I got him home and put him in his 10 gallon tank. He immediately started showing off his fins. He swims around almost always with his fins in full stretch and even swims over to me when I'm sitting there watching him. He reminds me of a dog in the sense that he seems to "wag" his tail when I'm about to feed him. He's wonderful.
Then yesterday, I went back to Petsmart and found a crowntail with a beautiful turquoise coloring, so I had to have him. I put him in his own 10 gallon and sat and watched him like I did with my halfmoon. He never stretches out his fins though, he mostly justs sits at the bottom of his tank, hardly ever swimming around, and when I walk over to his tank, he gets scared and goes to hide. Basically, he seems a lot less energetic than my halfmoon. What could be wrong?