Silver Dollars With Black Spots And Possible Fin Rot

[australia]

hey there i recently got 4 silver dollars and 2 of them have black spots/marks on them they only recently got them since i put them in my 8x2x2.
Also one looks to have fin rot on the end off its tale....


Here are some pics of them:

first pic is of the silver dollar with black marks:

here is the pic of the fin i think may be damaged or rotting?

http/i48.tinypic.com/33xe92q.jpg

what does everyone think?

 

[WILDER]

hey there i recently got 4 silver dollars and 2 of them have black spots/marks on them they only recently got them since i put them in my 8x2x2.
Also one looks to have fin rot on the end off its tale....


Here are some pics of them:

first pic is of the silver dollar with black marks:

here is the pic of the fin i think may be damaged or rotting?

http/i48.tinypic.com/33xe92q.jpg

what does everyone think?

What your water stats in ammonia, nitrite, nitrate, and ph.


Black Patches



Symptoms:

Black patches, smudges, smears, spots or markings that suddenly appear and are not natural colorings.



Cause:

These markings are the result of skin cell damage. Black markings often appear in areas where the skin has been damaged by ammonia burns, bacterial infections, parasitic infestations, and injuries. These markings are often seen on fish just after a new tank has completed �cycling,� due to the high ammonia levels. These marks are also common in African Cichlids, especially around the mouth. These are scabs that have come from digging in the gravel or from fighting.



Treatment:

No treatment is necessary. Much like scabs, the blackened areas are a sign that the healing process has already begun. Keep water in top condition and the areas will gradually fade in less than a couple of weeks.

 

[raptorrex]

hey there i recently got 4 silver dollars and 2 of them have black spots/marks on them they only recently got them since i put them in my 8x2x2.
Also one looks to have fin rot on the end off its tale....


Here are some pics of them:

first pic is of the silver dollar with black marks:

here is the pic of the fin i think may be damaged or rotting?

http/i48.tinypic.com/33xe92q.jpg

what does everyone think?

no need to treat those spots. they are totally natural. its common amongst Silver dollars. sensory areas, above and below the lateral line, cause changes in the slime coat. this makes them, seem, black. I'm not really sure why, perhaps some form of mating behaviour? it may even be a way of showing the mood of the fish. but dont worry, its not any disease.
not sure on the fins though.

 

[MBOU]

The black spots appear when they come into breeding condition!!!

 

[raptorrex]

The black spots appear when they come into breeding condition!!!

cool tell me more. usually when i ask that question, i get blank looks.