

What's wrong with my clownfish's poop?
Hey guys, I went on a trip recently and left my clownfish in the care of a friend. When I got back, I noticed their poop looks really weird. It's this brown, stringy filament-like stuff coming out of them.
They're acting completely normal and eating normally, but it looks like they're bothered by it. They sometimes try to rub themselves against the rocks or move around trying to get it off.
Does anyone know what this could be? And what should I do to help them?