Hi im new to fish keeping. I have a glofish tetra who constantly opens and closes his mouth. Im not sure if its just a recent thing or it was like that when i got him around 3 weeks ago. Im freshly new and trying to be as informed as possible hes is the only one doing this. Also ever since i got his i noticed his eyes arnt like the rest. Theyre sorta foggy kinda like hew blind or something .