I have enjoyed setting up a barrel pond and was given a plant I believe to be hornwort. Along with everything else, it is thriving. I have recently noticed (with the warm weather we are having) that it is producing what I can only describe as a 'candy floss' residue. My question is, should I be removing this from the barrel pond? I have a ball oxgenator and a miniature iris and lily. I think there is a frog living in there and I am not going introduce fish. Thank you