05-20-2010, 01:17 PM
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Originally Posted by scalar
is white play sand safe?
Depends what it is comprised of; some sands contain calcareous substances that will raise hardness and pH. Some may contain other substances or additives that hopefully would be stated on the bag. Of course it all contains dirt which has to be washed/rinsed out (very tedious
I would just caution on using white or light sand: it reflects light, and most fish come from habitats with dark substrates and many species actually feel insecure over a light substrate because it is, frankly, un-natural to them. I can get dark gray play sand here, and it looks fine; I'm intending to experiment with it in a 10g, but I have so far not managed to wash it sufficiently. I personally would never use white sand. Fish and plants also show much better colour over a dark substrate; in the case of plants it is aesthetic (just looks better), but with fish they are deliberately darkening their cell pigments naturally because it is their instinct, and their colours darken accordingly and sparkle and shine beautifully with a dark substrate and dark background.