There are many products similar to the one shown above. It consists of a vase or small container (even sometimes a large one) with a male Betta inside and a plants of some kind (most often a Peace Lily) on top. The worst part about these setups is that the persons selling them most often then not, tell the buyer that the betta does NOT need to be fed and can live off the roots. To add insult to injury, they also tell you that the water does not need to be changed. They claim that this is a mini ecosystem where the plant lives off the excrement of the betta and the betta lives off the roots of the plants. This is entirely not true. Here are a few important facts
1) Bettas a carnivorous fish, meaning they eat meat. This blows the whole idea of them living off the roots. You may see your betta nibbling at the roots, but if you were hungry enough, you would nibble too :( They need to be fed a supplement DAILY, twice a day is even better. Betta Bytes. Bettas do not generally care for flake food. Many people who have bought these vases have found that their betta will not survive without food and immediately go out and buy them some. The customer would rather keep their fish alive. Sometimes, the business themselves is ignorant to the facts and knows no better than what THEY were told.
2) Fish waste produces a chemical called Ammonia. Ammonia is toxic to fish, therefore regular water changes are necessary. The plant cannot take care of this problem entirely. Weekly water changes are the best way to ensure you have a healthy happy fish.
3) Bettas breathe the oxygen from the surface of the water. This can pose a problem if the roots are left to over take the surface area. It is really better for them to get to the surface to breathe. they do have gills and can breathe from the water, but their preferred method is the surface.
If you have bought one of these products buy your betta some food, it can take 2-4 weeks for a betta to starve to death.