my tank is a 65 gallon tank, with 6 bulb t5 lighting and im running a 10 gallon refugium with mud sand and kato. also have a skimmer that i run during the day. in the tank i have a large assortment of sps lps, and some soft corals in there and everything has been fine for a long time. recently i picked up some new corals at a frag swap. and since then everything seems to not be doing so happy. i have many different kinds of zoa polyps and 2 of the new ones have already died off and i have two blue steel zoas that are also starting to die off. all of the zoas that have been in my tank are still thriving. also i have some polyps of blastomusa merletti that started to close up and arent taking well to the tank. and i got a maxima clam that was doing good for a while but now his mantel is staring to fold up abnormally. i tested the tank and there is no nitrates, nitrites, ammonia, or phosphates. and i cant figure out why my tank is getting messed up now.