What type of fish do you recommend?

I would talk to the people in your area at the pet shop. The Platy and zebra's usually do well with sword fish neon's any kind of tetra. The neon's are very pretty and have alot of color to them. Hope this helps

I would pick up at least 3 more zebra danios. They are a schooling fish, and prefer to be kept in groups of at least 3 as a minimum. They're also a very active fish, and I bet if you increase that school of them, you'll see him zipping around the tank a lot more. For a 10 gallon tank, that would be all I would recommend, the 4 zebras and the platy. It's a decent size tank, but still on the small side. You don't want to overstock it.