03-18-2008, 11:22 PM
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Even without a clear picture, that appears to be hole in the head disease.
The problem with treatment is going to be your population. Can you please post the rest of your water params? (ammonia, nitrite, nitrate)
The meds needed to treat this can't be used in a polluted aquarium, and I have to expect that this one is, based on the info you've posted thus far.
Unless you can provide a much larger tank and/or seperate these fish so the tank isn't so grossly overpopulated, there isn't much that can be done. If you move it to a quarantine tank and treat it there, the fish may recover, but once it goes back into the tank, you will see the same problem begin again, and probably rather quickly. It is also just a matter of time before your other fish start to deveolp the same and/or other issues, all for the same reason... the tank isn't big enough for whats in it.
Can you please also post pictures of the sharks so we can properly identify them? At 4 yrs old all of those fish should be full grown or close to it. Angels should be between 6 - 8 inches in diameter, the blood parrots should be 8 - 10 inches, and depending on the type of sharks... anywhere from 6-8 inches and larger. These sizes are for each fish.
The blurring in your photos is from movement. The fact that the entire picture is blurred, this tells me it was the camera that moved, not the fish in the tank. If your camera has a manual focus, don't worry about background, focus it on the fish. It can take a few minutes to get a clear picture, and the photo should be snapped when the fish is still, even if momentary.
Can you please include a picture of the entire tank? That will also tell us a lot about the situation.