Did it slowly grow or just one day, BAM! instant mouth algae!
That's freaky! I think separating her in a quarantine tank wouldn't be a bad idea. Instead of pulling out the mass, you could opt to cut some of it so there isn't a mass ball of it floating around with her. You could also see if the ball itself has any movement in case they are worms.
I'm interested to find out what it might be. Keep us updated.
Final follow up. I took her out for better inspection. Turns out it was algae. It grew over time not on her mouth as it appeared but on a single hair that she halfway swallowed. I tried to get it loose but it was solidly attached to her insides. Sad to say that the ordeal killed her.
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