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Originally Posted by NancyG  I would second hummer. I think the dye in the gravel might not be good for your orchid.
NancyG |
I don't know to what extent the dyes leach from coloured gravel but fish tend to be quite sensitive to even mild toxic substances in their water. Now I'm not a fan of coloured gravel but it is used extensively in aquariums without noticeable detriment to fish or aquatic plants. Given the long history of spraying, watering or potting up orchids with God knows what whether or not they need it, I'd be surprised if there were any problems with toxicity.