Maybe get an ICP test done first, I will tell a story that happened to me in the late 80s or early 90s. Back in the day we used to get live rock from the South Pacific. It came wrapped in wet news paper, and they recommend giving it a 20 minute fresh water dip. My rock was going into a 300 gallon tank I did the fresh water dip and put the rock in. Tank was running well I had a blue hippo tank that was about as big as my hand. It disappeared one day. Everything else was fine. Then I lost a clown fish. Well I talked to many people and I threw a shrimp in and watched at night. Sure enough I had a mantis shrimp pretty guy but he cost me a lot and I had to break rocks to get him. Anyway good luck.