| Possible problem with new fish...advice?
One of my platy fish has just recently started acting a little odd. He seems to be going to the bathroom more, or at least it appears that way. He's had feces hanging a lot lately. He's also kind of solemn and has been sitting at the bottom of the tank a lot and is quite defensive when the others go near him. I don't know how else to describe his behavior but it's definitely not normal as far as I can see. They have been fed twice a day with TetraMin Tropical Crisps and everything else in the tank seems normal (as are the other fish). | 
