Anyone know what water cactus is? I was given a free sample by my feed store to take home to my ducks and see if they liked it as a treat. It looks like cat food and you are suppose to put it in the pond for them because it floats on water. Well I trust my feed store and they have not steered me in the wrong direction yet. I put some in there pool and they went crazy trying to catch it and really loved it. I tried to pull it up on google and can not find any info on it. All it takes me to is "how to water a cactus" and other pages like that. So does anyone actually know know this is and if it is ok for my ducks to eat? I do not want to give them anymore untill finding out more about it.