I've had TarTar, my blackish moor, almost 8 months. He's not really black anymore but that isn't the issue. He's developed this fluid filled sack at the starting of his top tail fins (fantail). It got about the size of a dime then burst, the top fins are to the point of falling off they are extremely blood red and painful. Its been 6 days and the fluid filled sack is filling again except it looks shinny. Almost like a silver pearl inside. My pictures arnt very good. But he's very hungry all the time but I leave his sight and he's laying again on his chest/face. There is about 1cm of white around the wound area and now looks like cotton growing off one of ripped off areas of his tail where the cysy? was. Or is, since its coming back today. Sometimes he's jerking really hard left to right and to be honest its breaking my heart to see him in pain. What do I do? Been treating with kosher salt, then life guard all in 1. His poop has been yellowish green, but his favorite food is peas. But its mucusy and big and takes forever to drop from him then he always tries to eat it.