My parents have a goldfish that I have come to adore. Recently, blood has come to the surface of her skin by her back right fin. It was a small spot at first but is now extending all the way down her right side and belly. Not much goes in the water so it appears to mostly be under her skin. Could she have internal bleeding or a disease? Is there a large artery there that could have burst? She does not appear to be in pain but is very listless and just floats on top of the water. She does still eat but finds it hard to do so as my parents have fed her so much that she's now bottom-heavy so can only swim upside-down all the time. There are no rocks in her tank - only some plastic seaweed. We have not noticed her running into the tank or anything like that. There is no filter in her water - she's in a 10 gallon tank alone, which is cleaned every other day and filled with well water. My parents do have one other fish in another tank which gets this same water. The bleeding fish really breathes hard when she doesn't get fresh water every other day - but once the water is changed, her breathing is better for a day or so. What could the bleeding be? I love her dearly - and none of us can imagine putting her down. Thank you so much for input!!!
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