I picked up a ball of chaeto from a friend at work and it has been my biggest mistake since starting my reef 7 months ago. Along with the chaeto came red flat worms and aiptasia. I have two difficult to get to very large aiptasia in hard to get to spots. I have tried lemon juice but they close up as soon as I get close with the syringe.. I can't get a Berghia nudibranch because I have a wrasse and the wand and lasers methods I don't trust. But aiptasia x looks promising. Any success stories?