I've had her/him for around...a 2 months I believe? 2 tank mates of other goldfish in a 40 gal
. I just added some wood that, although was soaked, still leeched some tannins. Nothing bad though. The two other goldies are perfectly fine, but this one keeps her fins close, is always lethargic and always hid whenever possible.. just today I've noticed some small black dots on her scales. I've put her in a quarantine tank for now. The past few days, she's also gotten a bit bigger, but I think she's too young to be pregnant.. Levels are as normal as ever, same with the tempature...can anyone help?