I’m so sorry this is happening. I guess it’s kinda late to tell you what I did when I moved tanks. Like others have said, I would take all the sand out and put new sand and new water. Is there is someone that can take your corals for a bit and rehabilitate them? Also, if you live near a Petco, you might check to see if they have any specials on tanks. If you’re Rabbitfish is stressed maybe a small tank of his own would make him happier. Good luck!