My swordtail has been hiding and having what appears to be white stringey poop. I had my upside down catfish die today. I had forgotten to put dechlorinator in and that was most likely the cause of his death. Maybe this is the cause of the swordtails sickness? I also have a firemouth cichlid and another new upside catfish in my 40 gallon. It is a planted tank. The swordtail has been fed flake food mostly yet I have tried shrimp pellets today. I have heard this could be a parasite or stress. I hope my others arent infected too. I stayed safe and moved the swordtail into a rather small container and attempted to feed it for I saw it was trying to eat before. I dont think it ate. Help please and thank you!!