I have a 75 gallon fish tank, and at one time or other I end up using the water to water both orchids and other plants. This fish tank water is from the tap, and some kind of dechlorinator is always used. I've used prime in the past. These days I went to the simpler (easier to find) Tetra Aqua Safe Plus. It has never caused any problems. When I drain the tank (in the warmer weather) I just send it by hose into the garden. In the winter it is too cold so I send it by hose to the bath tub. I have a pump system, which semi-automates fish tank water changes. I've had the same fish in the tank, for over 6 (some up to 8 years) years so they seem to be happy with it.
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