I use plain vinagar and water and one of those scubbers that are safe for non-glass tanks. I have hard water and I have to clean my tank, hood and equipment every now and then. I researched what is best and they said White Vinagar and water 1/2/water 1/2 vinagar in a spray bottle. I keep this with my fish suppys and label it to clean the fish tanks only. It's safe for fish.
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