something red on my fish

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[RigotoniMan]

I left today for a visit to my parents and when i got back i noticed my blue green chromis damsel had a red spot toward its tail no idea what it is but im fairly sure it wasnt there this morning.  have a clown, bicolor blenny and a few hermits in the tank with it maybe it was some sort of aggression? no clue any ideas?

[fogish]

Do you have a picture? How long have the fish been together as well as the size of tank. It can be water quality (what is your water quality right now?) or an injury from another fish, hemorrhage from bacterial infection. Something else I  may have forgotten. Your answers can narrow it down.

[RigotoniMan]

Ammonia is at 0, nitrite is at 0, nitrate is at 10ish, and Ph is at 8.2.  the redness seems to be disappearing rapidly now.

[Ed]

  
How are the eyes of the fish?  

Here are  some symptoms of bacterial infection of fish.

Symptoms
The common signs can be one or a combination of the following:
Reddened and frayed fins, or red streaks through the fins.
Disintegration of the fins, i.e fin and tail rot.
Redness around the area of the lateral line, often seen as streaks or blotches.
Open sores on the sides of the body and near the fins.
Bloody scales at the base of the fins.
Rapid breathing.
A grey film over the eyes.
Listlessness or lethargy.
Loss of appetite.
Abdominal swelling or bloating. This is sometimes a sign of a bladder infection or block.

[Ed]

Possible causes of bacterial infections.

Poor environmental conditions. If conditions are poor enough, the bacteria can bloom and overrun even the healthiest of fish. White cloudy water with the presence of sores on the fish can be signs of this problem.
A secondary infection resulting from having another disease.
Poor nutrition.
Injury, such as open wounds, cuts or scrapes.
Harassment.
Stress.
Weakness.
Old age.

[Ed]

Glad to hear your fishes health seems to be improving.

Here is what I would have suggested if he did not.   

Make up water matching the Ph and temperature of tank water in a quarantine tank.    You can bring the  ph down conditioners or Baking soda to bring it up.

After you have matched temperature and Ph then I would use Maracyn 2 as directed. 

[RigotoniMan]

thanks for the feedback guys found out today as i was watching the fish that the blenny has some hate issues with the chromis, keeps goin after his tail. pretty sure that this was the cause of the redness. again thanks for the help