I've had mine for 12 years or so. It was the size of a pencil cut in half when I bought it. I got it from the fish nazi in Everett before I knew better. They are non-photosynthetic. I almost never directly feed it. I have alot of fish, so there is usually plenty of mysis floating around for it to capture. I did at one time, and it seemed to grow pretty quickly with regular feedings. They are powerful, but no nearly as much as a carpet anemone ime. The only fish I've ever witnessed it taking were very small fish just after they were introduced, or a fish that was sick to begin with. I would imagine they can take a smaller fish if they had the opportunity, especially if one got spooked and took a dive into it. The tube that gets buried can get quite long. The last time I moved mine, the tube was almost 3' in length. They are also quite hardy. Mine has survived a few mishaps in the past. Also, don't underestimate the amount of room they will need. At night, mine gets really tall and can sting corals that are 6"-8" away from it, in any direction, during the day time.