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When filling aquarium for the first time is it better to use soft water (Cullagan Water Softener) or try to tap into a valve upstream of the Softener and just use plain hard city water?
Soft H2O is 1.0 grain on hardness. Hard H2O side is 5-6 grains od hardness. Fish would be tropical freshwater (mollies, guppies, neons, angles) w/ some plants.