If the color of the protrusion is more of a red-ish color, the leading suspect would be camallanus. If the color is white, it could be a prolapsed anus. Both happen, although camallanus would have to be introduced. And if one fish get's it, they all will get it. A prolapsed anus will be unique to a specific fish and not spread.
Camallanus is very difficult to treat. But before I go into that process please google it to see if the symptoms fit your fish.
A prolapsed anus is also difficult to treat as there can be several causes. It either heals or it does not. It can be a sign of blockage, which would eventually be fatal.
Recommended treatment (for prolapsed anus) would be:
1. Stop feeding for a couple of days.
2. Dose with Epsom salt at 1 teaspoon per 5 gallons
3. Medication containing metronidazole & praziquantel somthing like api general cure or
If it's a prolapsed anus, you need to change the foods to something that contains less meat protein
Read this if you want http://www.monsterfishkeepers.com/forums/showthread.php?t=339362
Camallanus is very difficult to treat. But before I go into that process please google it to see if the symptoms fit your fish.
A prolapsed anus is also difficult to treat as there can be several causes. It either heals or it does not. It can be a sign of blockage, which would eventually be fatal.
Recommended treatment (for prolapsed anus) would be:
1. Stop feeding for a couple of days.
2. Dose with Epsom salt at 1 teaspoon per 5 gallons
3. Medication containing metronidazole & praziquantel somthing like api general cure or
If it's a prolapsed anus, you need to change the foods to something that contains less meat protein
Read this if you want http://www.monsterfishkeepers.com/forums/showthread.php?t=339362
