Realistically any airborne toxins, microbes would work ther way into your tank anyway. figure if de-humidified water's safe to drink, then it should ok for pwc
However, because it's nutrient poor, it won't replenish the minerals you get from tap. I do suppose it could make a good alternative to RO
water ... This is assuming the dehumidifier is in good, clean working condition.
75g Planted Barbs Denison, BlackRuby, Tiger, Albino Tiger, Green Tiger, Cherry, Gold, Checkered, Odessa.
NonBarbs Cardinal, Neon, RummyNose, Bloodfin Tetras, Z. Danios. 1RTS. Amano, Bamboo, Ghost & RCS. 20g Long Shrimp Tank RCS, Tiger, Amano.