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#1
03-15-2007, 05:49 PM
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I would agree with a previous post about checking your oxygen levels. My tank is established and has been running for a number of years. All of a sudden one morning I had a dead pygmy angel and a tang in distress. The tang recovered later in the morning after the lights had been on a while. I had repositioned a power head a few days earlier and the circulation at night had changed with not as much flow at the surface.
As the corals have grown larger, they are now requiring more oxygen at night for respiration leaving less for the fish. By altering the flow there was now too little for the fish. I think Angels are particularly sensitve to oxygen levels. The only way I was able to figure this out was seeing the Tang recover. If they hide in the rockwork, you will never see them in distress and may never find their bodies. Adjusting the powerhead to ensure surface agitation at night solved the problem. 
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#2
03-15-2007, 10:06 PM
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One more thing I just thought of. You never did post if you checked your RO system.
A friend of mine had the exact same thing happen to all of his new fish. Turned out he was buying RO water from the store and they hadn't changed their filters in a long long long time. As soon as he bought his own RO system everything was fine.
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250 gal display tank plumbed directly to my wallet
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#3
03-16-2007, 03:22 AM
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Black Phantom hit upon an excellent point and I can say from experience, test kits go bad. Take a sample of your water to the LFS and have them test it, then compare what they say to your readings...
Dumping fish into a tank is one way to deal with fish that have been shipped over long distances and time. The theory is, the water they are shipped in will have massive amounts of ammonia, however the pH will be very low due to lot's of CO2 in the water so the ammonia may actually be in the form of non toxic ammonium. However, as soon as you start adding tank water the buffers, O2 etc will quickly raise the pH and the ammonium will change to toxic ammonia. They figure the change in water chemistry will be less stressful on the fish than dealing with the ammonia. If you aren't finding bodies I figure something is eating them, any green brittle stars? Keep us posted as you find things out. Doug
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