So I have had no luck keeping Tangs of late. Over the past 6 months I have tried 3 Yellow Tangs from various places. I drip acclimate and put them in a quarantine tank, generally for a month. I scrub the tank, heater and all parts between fish and make Fresh RODI, and make the salinity .025. A small fiter, heater, and large PVC pipe for them to swim through. I only have one fish in there at a time. I havent got one to last more then 2 weeks, and usually they have died within a few days. I went to a local fish store over the weekend and purchased a Power Brown. I know, more trouble then a yellow, but I have been doing this for years, and am familiar. I dripped him for 3 hours then moved him in. Again new water, and this time a new heater, and new filter for better water movement connected to my air point. This one ate on Sat and Sun and swam around happy. Sunday night i came down, and he was on his side struggling, like all the other tangs did. He died later on after doing my best to get him back. I am so frustrated with the amount of money i have spent on these fish. The Clowns, Tangs , Gobies and StarFish are extremely healthy in my DT. I use the same RODI and Salt to do their water changes, so that can't be the issue. Does anyone have any idea whats going wrong? Its so frustrating. I don't think its bad fish anymore. but I am out of ideas.