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  1. 30 gal tank with three large goldfish. Problem is with black moor. This started after a period of not the best water more than a month ago. At that time i thought ick was starting so i treated for that, but it wasn't an obvious infection and i caught it really early. The water has been pristine since with many water changes. I am fairly novice tank owner but have learned a lot since researching this issue. I first noticed brown triangle on underside, that I now know is the vent. It is swollen and appears to have bulge coming from it. She/he was normal, other than the brown triangle for some time. The fish, Bug eye (not very original), then started having trouble swimming, swimming upside down, floating with head down, what I thought first must be swim bladder. I also noted no poo and she looked a bit big in the underbelly but no where else. No raised scales, no trouble breathing, gills look good, appetite good, fins good. I first tried fasting and then feeding peas. I did this the first couple weeks. I also treated for parasite in case bulge was fluke. After this no real change. I have tried an Epsom salt soak in the past week , about 15 minutes every other day. This helped a bit as she swam a little better, but then reverts back to either floating, a lot upside down, or swimming around wildly. Now she/he has changed from floating face down to on her side. She looks dead but then comes alive, swimming wildly. After the fasting and peas I started feeding regular but less. I feed combo of flakes and variety of freeze dried: shrimp, krill, bloodworm. She eats when she can get to it, I can hand feed her krill and seems really hungry. Her poo today was super thin, long translucent with a small amount of obvious poop at the end. Could this be egg bounding? The bulge from the vent could easily be an egg since today I found pictures of spawning, not quite as translucent as the pictures. I will post picture or video as soon as I can. It's hard to see the vent with all the fins wafting around. Thanks for any help.
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