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I have two common goldfish. When I got them, both were bright orange. I went away for a couple weeks, and had someone look after the fish while I was gone (fed them, replaced water as it evaporated, but no water changes), and when I returned, one of my goldfish had turned white! The other is...

I have two very small goldfish in a 12-gallon tank (I know, I know, 10 gallons a piece, maybe when they're bigger). The fish, Jean Valjean and Marius, get along fine in general, and are both very alert and healthy. In fact, they get all excited when I come near the tank and wiggle up and down...

My goldfish's tail has suddenly developed a black edge -- the end of his tail is dark for maybe half a millimeter. I think the very tips of his pectoral fins are dark too. What could this be? The other fish is fine. Tank parameters (ppm): nitrate: 20 nitrite: 0 water hardness: 25...

Hi, I'm new here. I recently inherited two goldfish and a very small tank (over the weekend a friend of a friend needed to leave town quickly and was giving away his two goldfish and their one-gallon aquarium). One of the goldfish seems to be having some trouble as of tonight. They were fine...