Thread (please do not post on linked thread, post on this thread instead)- http://www.bettafish.com/showthread....highlight=Etsy
My letter to the shopkeepers-
"Dear Mr and Mrs Smith,
I contacted you to inform you about the "betta bottles" that you sell. You suggest that these less then 1/2 gallon bottles be used for fish, but these do not make suitable homes for them. I am a betta breeder, keeper, and hobbyist, and I own over 100 bettas.
Bettas are native to Thailand, where the water temperature stays between 76 and 86 degrees fahrenheit. To maintain this temperature, a heater is required. There is no where or way to put a heater in these bottles. If bettas are to cold, their immunity is compromised, leaving them susceptible to disease. Keeping bettas in cold water dramatically decreases their lifespan.
In a container this small, a toxic substance called ammonia (which all fish excrete) will build up very rapidly. Ammonia burns and eventually kills the fish in a very painful manner.
Bettas are anabantoids, meaning they use a special organ called the labyrinth to breath air from the surface. To do this, there must be sufficient amounts of oxygen available to them. In these bottles, the airflow is not enough. A betta could potentially suffocate living in one of these.
There are many, many things wrong with keeping an animal in one of these liquor bottles. The betta in the picture that you show is very unhealthy and close to death. Advertising improper betta habitats like this only increases the incidence of animal cruelty committed by people who do not do their own proper research. I know I am not the first to file a complaint against this product. Please change this advertisement and remove the false information about keeping bettas like this. I am prepared to contact etsy if this does not change.
Edit- Yes, I have seen those. What a great way to teach your children how to take care of animals.