Viewing post #2912101 by ellie5010ml

Ursula said: Hi Ellie,
yes, you can use tap water. Just bring it up to room temperature and if you like, let it set for overnight to let any Chlorine dissipate. I personally use sometimes tap water, but prolonged use of the hard water in my area clogs up the "pores"/stomata, and some delicate Orchid suffer in the long run. I use mostly rainwater. Don't bother with distilled water, it has no benefit at all.
I kept Fish in my greenhouse for some years and Orchids absolutely loved the "dirty" water I poured over them when I cleaned the tanks. Especially small mounted species and Slipper Orchids really thrived on that routine.
You might add some fertilizer with a higher middle number once in a while to regular water as a bloom booster.

So you think it would be safe to use my fish tank water? I do significant water changes once a week and use it to reduce waste and help out my plants. it's lots of water so I use pretty much exclusively that water. It sits in my watering can until I'm ready to use it, which means if I have to switch to tap then I either use a water bottle or have to empty out my cherished aquarium water.

Most conveniently, I'd just use that aquarium water and nothing else.