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You can, but its not really needed for most set-ups. Its far more important if you are doing saltwater or trying to maintain very specific water conditions for breeding difficult fish. Actually, it will be easier and cheaper to not use distilled water 99% of the time because its "free" out of the tap and will help maintain more stable conditions.I'm not sure if this is the right place to post this but here it is.
I've read online that you can use distilled water instead of tap water during a partial water change. I just wanted to see if what I read online is true.
If it is do I need to treat the distilled water with dechlorinator like I would tap water?
No. If you use distilled water, you do not need to chlorinate it. However, if you are using it as part of water changes, you will need to add minerals back into it. Pure water is not good for the fish or plants.