tiger barbs frequently do this after feeding. quite often they eat so fast they ingest 'dry' food that expands inside their stomach, causing them to swim tail up and head down..
The tiger barb has looked the same ever since they bought him. He has also lost a lot of color, is lethargic, and has never acted this way before. He will be swimming, stop suddenly, turn face down, and twitch a little.
The tiger barb has looked the same ever since they bought him. He has also lost a lot of color, is lethargic, and has never acted this way before. He will be swimming, stop suddenly, turn face down, and twitch a little.