Dr. Tim's Aquatics AquaCleanse Freshwater Aquarium Cleaner, 64-fl oz bottle
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1 Customer Questions
Is it safe to leave fish in tank?
Answer by • Jan 14, 2026
Fish can remain in the tank during water changes as long as the tap water is treated with AquaCleanse before it is added. Untreated tap water should not be added directly to the aquarium, as chlorine and chloramines can be harmful to fish even with brief exposure.