Well finally found out why most of ,my acros died. Had acro eating nudibranchs, only eat acros. everything died but some stags slimer and other things. other SPS is fine though. I just can never do acros in the tank again. they're probably in the sand and rock so everything will be thrown out for the new tank, corals will be dipped and looked over. Thanks to Chris from reef koi and helped solve my problem, gave me some RX and saw like 50 of those things come off the coral. So dont risk it, dip your corals everytime you buy them incase of the the little pests that kill them. Any oppinons on if I should use any of the rock or sand for a new tank? How about corals should they go into new tank or just get rid of them?