I bought mine from ebay, and put it in my refugium. It died pretty quickly, and then over a year later this bit sprouted out of the rock...I was so excited. I think it's like caluerpa in that once you've had it in your tank there is always the potential for it to spring up somewhere. If it were me I'd do my best to keep what little bit of it you have alive till it gets big enough to tie it to a rock with fishing line and hope that it roots.