If your dehumidifier is very clean, then the water in it should also be clean cause its similar to distilled water (pulled out of the water vapour in the air).
At the same time, they say the air in our homes is way "dirtier" than the air outside, so I use mine to water some plants. Not sure if any copper or other potentially harmful piping is used in your dehumidifier.
It's a risk/reward situation. Is the "risk" of killing your corals worth the "reward" of recycling some water?
Rule of thumb for what water to use: Would you drink it?
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