Fish Eat Fish;2349519; said:From what I have read it is fine as long as you just keep them in a "warm" spa and not a "hot" spa.
you can buy them here
http://www.banneechen.com.sg/catalog/index.php/cPath/191
just make sure to treat them like any other pet and provide for them before providing for yourself
Also, if the fish was suffering in too hot water, they wouldn't be in the mood to eat.