So sorry, FA, that you're having this problem. That really looks very bad, and I agree that it looks like an intestinal prolapse. Here's a link to a thread (only 3 pages long) that has some tips, and a couple of other links to similar cases are within this thread.
http://www.aquariacentral.com/forums/showthread.php?t=219399&highlight=prolapsed+intestine
Pinkertd, one of the mods here on AC, had some good suggestions and further links in her post in this thread, and in one of the links she included in her post there were some suggestions from another very experienced fishkeeper, Kyryah, too, regarding prolapse.
Here's another link to a thread dealing with intestinal prolapse in which Grannylvsfish cured a Molly with a prolapse, but it didn't look as seriously prolapsed as your Angel's case.
http://www.aquariacentral.com/forums/showthread.php?t=181777&highlight=molly+prolapse
I'm really afraid that as bad as your Angels prolapse appears to be - euthanasia is going to be your best course.
Also, the other fish will pick at the prolapsed intestine and do serious damage and it will be very traumatic for the Angel, unless you can get him out the tank with the other fish.
I'm so sorry for this sad situation. My condolences.
http://www.aquariacentral.com/forums/showthread.php?t=219399&highlight=prolapsed+intestine
Pinkertd, one of the mods here on AC, had some good suggestions and further links in her post in this thread, and in one of the links she included in her post there were some suggestions from another very experienced fishkeeper, Kyryah, too, regarding prolapse.
Here's another link to a thread dealing with intestinal prolapse in which Grannylvsfish cured a Molly with a prolapse, but it didn't look as seriously prolapsed as your Angel's case.
http://www.aquariacentral.com/forums/showthread.php?t=181777&highlight=molly+prolapse
I'm really afraid that as bad as your Angels prolapse appears to be - euthanasia is going to be your best course.
Also, the other fish will pick at the prolapsed intestine and do serious damage and it will be very traumatic for the Angel, unless you can get him out the tank with the other fish.
I'm so sorry for this sad situation. My condolences.