I do not believe it is toxic. I even washed the tank with laundry detergent to get most of the grime and dirt off before using the water stain remover. My female golddust has been in the tank for almost 2 months with zero problems. She laps up the water from the sides of the tank all the time. People use ammonia and other strong agents to clean or kill viruses and bacteria. Just make sure to thoroughly rinse to make sure there is no residue. If you do use something such as ammonia, make sure to air out the tank really well. You do not want your pets to die due to toxic fumes. Be it from the detergent, the water stain remover, or whatever it is you are using to clean your tanks. Also, be sure to wipe the tank dry when cleaning to prevent any water stains as you will be using ordinary tap water to clean.

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