Hi All, I'm thinking of taking down my tank, and am wondering how I go about safely killing off the few green play zoas I have left on a piece of rock. The rock itself is covered in algae, so finding it a new home with the palys attached seems unlikely. I'm wondering if I can bury that zoa-covered rock upside down in the sand bed to safely kill off the zoas without worrying about releasing toxins into the air. Thoughts? Thank you for looking.