blue water at petsmart?

ok, i just bought a new female beta to maintain the balance in the tank, since i had to take an overly aggressive female out. anyway, why exactly does petsmart keep all of their betas in blue water? i have heard that it was for color, but i personally hate the blue water because i have a nigh on impossible time of distinguishing the color of the fish. obviously i choose first on personality, but when i find several of different colors who have good personalities, i try to pick one that has a vibrant color and who would be a different color from my other betas. anyway, what purpose does this blue water serve?

 

The water has medication in it......they may be using it as a preventative

 

H tuttifrutti, It is common for shops to use Methlyn Blue in the water for Bettas. It is used as a prophylaxis to keep them from developing fungus especially fin and tail rot.

 

ah, ok. thank you. that makes me feel much better about continuing to purchase my betas there.