Goldfish scales raised indicates fever
Goldfish scales raised indicates one or two things. The fish either has infection causing fever or the water is too warm. Check to see if other symptoms accompany the raised scales, such as swelling or red patches on the body. If not, chances are the water temperature is too high. Being cold blooded, goldfish prefer cool temperatures. The comfort zone is 64f to 74f, although they can withstand lower temperatures and a little higher as well
The goldfish’s body temperature is the same as its environment, making it all important to maintain consistently low temperatures. In its natural environment, or even a proper pond, it has the option of going deeper in warmer or colder water. The earth is a great insulator. In an aquarium, there is no escape
Goldfish use more oxygen in warmer water due to increased blood flow. Toxins are more dangerous because of it. Parasites thrive in warmer temperature. In most cases the water quality in a pond or aquarium is less than it should be. As the water warms, the fish begin to show symptoms
Whether your fish have raised scales due to fever or warm water, lowering water temperature is the key. Goldfish are cold fish