Hi all, this question is for my sister. She has a pet fish, its some sort of tetra, neither her or I know the technical name. I know a lot about fish because I have kept them in the past, Ive had several tanks, and so on. Her tank is completely set up wrong, she has no money thats why its done this way. She doesnt have a filter, heater, chemicals or anything. She didnt cycle it, she just changes the water every day. The fish has red in its eyes and she says its really bad. Is this a typical eye or is it a disease? If its a disease what can i do to fix it for her? thanks.