Posted: 12/03/2012 at 18:57
chlorine, heavy metals in fish tank water? that would be a fish tank without any living inside but ok i guess you studied hidrobiology. Well if you didn´t do any fish desease treatment cause most of them contain copper you can use it on any edible plant its jus like a very dilluted fertilizer. And if you have some fish from amazon region like neon etc. which prefer osmosis water which has very low level of carbonate in it its indeed excellent for orchids too. Over all fish tank water doesnt contain any substances as maybe peat or oakbark extract to make perfect ph for south american fish species or maybe NaCl if its a seawater aquarium-this water i wouldnt use for any plants who are not specialized in salty soil lol.