Yes, you can use purified water, but don’t be lazy. Do not just dump it in and hope for the best. Your fish aren’t ninjas—they can’t survive sudden chemical swings. Remineralize, mix, or use it only for top-offs after water changes.
So go ahead, grab that bottle, but treat it like a tool, not a magic fix. Your fish will thank you with brighter colors, more energy, and maybe even a little bubble nest. Now that’s cool, right?
