I AM HAVING FISH CENTERPIECES AT MY WEDDING! i think it is a totally ok thing to do. i don't have any guest that will poke the fish nor will i flush them when we are done! i think it is a great idea. i asked a question about it and people were ass holes about it! yeah i agree people shouldn't poke them or flush them pour their drinks into them but it's a wedding not a frat party hello? we have having big round 9 inch wide by 8 inch tall bowls, blue rocks and a blue betta in each bowl. we are going to let the guest take them home after the wedding and we are providing "betta grab bags" that have food, something to carry them home in as well as the tank, and a care sheet for them. people will say "i don't want to go to a wedding and come home with an unwanted new pet" ok, then don't take one. it's a fish, the are easy to care for, i'm not saying "it's only a fish whatever" it's a life i know that but on the difficulty level of a pet it's easy. i already have a friend who will find them homes after if not all of them find homes at the wedding. it's ok if you are responsible about it.