Purple Tip Blueberry acro

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   So when I bought this 400 gallon tank, It came with a lot of unknown corals. One of these was a giant acropora that was browned out. It had some clown gobies living in it as well. They did not survive the trip and the overnight stay in a 44 gallon trash can. So the Acro sat in my tank and grew to about 21" across and suddenly, green polyps began extending and though it was brown, when the polyps extended, it was green. Then the arms changed color. They were violet/blue and on the tips, purple. I kept trying to get a good camera over here to get some shots because this was a show piece. I scoured the web looking for a match for it and came across the Purple Tip Blueberry Acro. It was a perfect match. One day, doing some tank maintenance I bumped it and a frag broke off. I set the frag high on a shelf of rock and it was swept into the embrace of my Duncan colony. I noticed it about an hour later and plucked it out and just sat it on top of the Acro that it broke off from. What happened next was a nightmare. The next morning there was a dead patch where that frag was sitting. about the size of a computer mouse. The entire colony was spewing a thick slime coat that was streaming off of it. I pulled that frag off and put carbon in a reactor in my sump, checked params. Nothing else in the tank was having any issues. I have about 525 gallons of total volume. Skimmer was running, Macro Algae was growing and all my corals seemed happy. The next morning, it had a dead patch double in size. I decided to clip it high and away from the die off. I pulled the rock it was on out of the tank and let what was on it die after clipping a dinner plate sized frag. 8 hours later I thought we were good. the next morning, half of it was dead. So again I clipped as far from die off as I could. This morning all that is left is 5 frags. None over an inch. All from the very tip of the colony. the newest growth. I will post pics when I get back from work. The rest of my corals are still happy. All this from coming in contact with Duncans?