Black spots on my fish?

Black spots showing up on my gold fish...?

• I had bought some gold fish the other day and one is strictly gold and the other one is gold and white... Now Im starting to notice that there is black spots starting to show up on them. They are the feeder fish that we had originally introduced to the aquarium and then we put in a few days later the calico fan tails and regular fan tails and a few black moors. Im just wondering if the fish can change their coloring if there is other kids of fish in the tank? Or do you think that they are getting sick? They are swimming around like they are not but then again Im not a knowledgeable person with fish though. Any ideas or help would be great.

• Answer:

  Black spots on goldfish is a result of poor water quality being that the ammonia level in the aquarium has spiked. When the ammonia level in your tank increases it causes black spots to appear on the goldfish body and black tips to appear on the tail, pectoral fins and dorsal fins. These black spots are a result of ammonia burn. People should think of ammonia like acid, when the ammonia is extremely high it cause ammonia burn, just like acid would do to human skin. It causes discomfort in your goldfish and high levels of ammonia can kill your goldfish. As I've mentioned before people really need to take care of their goldfish properly. If you have an aquarium or goldfish bowl, you need to have water test kits around. This is a necessity if you plan on keeping your goldfish healthy and living a long life free of black spots.