Just a quick update in case anyone is interested. I added a tiny 6-Line Wrasse to the tank and I think it's working. The spaghetti worms have stopped throwing our their tentacle, I think because he's picking at them. The zoa's are doing better. Wonderful success. And because he's so small he's not picking on my Yasha Goby or pipefish. So far so good. Big thanks to the guys that recommended a 6-line, I'm grateful you posted!!