I keep DPs in a planted 10 gallon tank.
They are AMAZING little fish, and so cute! So far, they've been quite easy to keep. With all the live plants, the tank is a breeding ground for snails, which they hunt on a regular basis. Occasionally, I'll feed them blood worms, which they'll pick over brine shrimp any day. They come up to the glass when I go to the tank to look at them, and they seem to play with each other. Whether or not they're playing or protecting their territory is something I haven't quite figured out yet.
They do sleep on or in various plants. I've noticed that they prefer ferns to sleep IN and broad leafed plants to sleep ON.
The best decor is on that breaks up the line of sight, as sometimes they like to be shy and hide. Mine enjoy swimming up to the filter's water stream and riding it down to the bottom of the tank. They're cheeky little fellows, and I can't imagine my home without them!
good luck if you decide to keep them!
Oh, and if I repeated anyone, sorry!! :D