Sounds like some kind of fin rot or parasite is living in your system. My Moorish Idol had that and I thought I was going to loose him. He had no bottom fin left, his tail was all ragged looking and he had no "streamer" at all. I just made sure my water was well oxygenized (is that a word?) and fed a good mixture of meaty food, garlic, selcon, and nori. It went away on it's own and he is now beautiful again.
Sorry - not much help. Don't know if a lack of oxygen could cause this but I do know that angels really need a lot of oxygen in the water.
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