Thanks all for your input. I do watch what sprays and/or chemicals are used in the house as we also have a cockatiel and dog.
The only question I still have is how to disenfect my tank without the use of cleaners. I am also wondering if cleaning it when my other fish died was not done well enough. All I did that time was use very hot water on the tank, decorations and put in a brand new filter.
I did forget to mention that Angel (pictured left) was a rescue from PetSmart. She didn't have a very clean cup and her fins were kind of ragged. Maybe she was never 100% well.