i just got my betta fish maby about five days ago. he was dark purple and bluish when i got him. now it seems like his dark color is fading away. i have him in a small bowl change his water about two-three times a week and his diet consists of 7 freeze blood worms a day. but i fast him one day of the week. could i be over feeding him or is he sick or depressed to be losing his color? i never had pet fish before so hardly no experience.