I am so sorry that someone would do that to your fish :( my friends joke about feeding my fish drugs. (They watch Skins too much.) I definitely don't take the joking lightly. I really hope he gets better! xx
I'm so sorry that happened to dede. if that was my fish...LAWSUIT. Willful animal abuse is not okay. Make sure he doesn't turn into a killer. Sick, sick person. I'd give him a call.
Do you have stress coat in the water? Make sure ammonia, etc. stays at 0ppm, and add some stress coat and just keep him comfortable. Bettas are hardy creatures. Make sure he eats. He's probably really disoriented. Give him time to rest. I wouldn't shine any lights on him because he might be sensitive? If he won't eat pellets/freeze dried, get him live food.
sorry,that is hard. too bad we don't come preprogrammed to have intellegence and compassion. parties are a no-no at my house. i too had a party once. the next morning i found cigarette butts in my tank of veiltail koi. i had them for 12 years before they were murdered. i could'nt do anything to help them.