[littlefrog]

Originally Posted by Silent Running

I have a fully planted 100 gallon fresh water aquarium that I perform weekly water changes on. I maintain nitrate at 10 ppm, phosphate at 1 ppm and potassium at roughly 15 ppm. I also add trace elements and iron to the water as well. My question is whether or not the water from this tank can be used for watering my new (and first) orchid (phalaenopsis). I use the water for my other house plants and they do really well with it, but I'm not sure if it's appropriate to use on an orchid. Any input would be appreciated.

Aquarium water is fine for orchids. Saltwater tanks excluded, of course. You may be tempted to rely on the fish waste in the water to fertilze your orchids, but I'd try to avoid that. The fish waste won't hurt anything, but you will still need to fertilize your orchids with a good complete fertilzer, at least occasionally. All of your houseplants would probably like a little plant food.

Rob