Artificial plants are fine. Most people don't like the look of them but there are some that look very real. The only thing I would caution you against is buying those that have sharp edges and such. They can rip a fish's fins, expecially fish like bettas or guppies that have large, flowing tails. Silk plants are definitely the best. Another thing to keep in mind with artificial plants is that they don't need light to grow and your fish dont really like the light so only burn your lights when you are there to view the fish. Burning the lights too long will lead to algae problems.