03-27-2012, 07:32 AM
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Angelfish going on a hunger strike is fairly common when they are stressed, so I would say that's a pretty good indication that something isn't right for him. It could be an illness, or could be something larger.
You said you've had the tank for 1 month. Did you cycle the tank for 4-8 weeks before adding fish? Or were the fish in the tank before that 4-8 week period?
Do you have an Ammonia, Nitrite, and Nitrate test kit? If so, what are the readings? If not, go buy one. The API Master Test Kit is ideal.
What is your pH? Do you know if you have hard or soft water (GH would be really helpful to be specific)?
82 degrees is too high for some of your fish, but not for Angelfish. Wild caught ones actually need a temp in the low 80's.
A Red Tailed Shark is not a community fish, it will turn aggressive if it hasn't already. The aggression grows as they get older. You can click the shaded name to learn more by reading the profile here.
As already mentioned, Gourami are not a good choice to go with Angelfish. Angelfish are slow swimmers, sedate, and do not take well to any kind of aggression, fin nipping, or fast swimming fish. Gourami can be somewhat aggressive, more so in some species than others, but none are suitable with Angelfish.
Aggression is not always something seen, it can happen at night and it can happen simply from pheromones the fish release into the water. They can 'smell' the other fish and their mere presence can stress them.
Angelfish also come from dimly lite environments, so floating plants are a very good idea to provide shade. They also like to swim around lots of branches.