12-16-2009, 07:21 AM
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I made the mistake of using white marble chip sand in my goldfish tank...
Wth the lovely brown algae, blueish stain from medication, and constant supply of poop, looks dull and gray, absolutely horrible... White was a bad choice :p
I think in any tank, silica sand looks better - bright, but not too white.
Marble chip is absolutely colourless, like salt or sugar, and tends to wash out other colours. There's just enough golden hue in silica sand to look natural and harmonious.
The black sand/gravel in the 55g tank looks velvety and nice, and the lonely minnow inhabitants have deepened their colours significantly after mere hours in there. I think it would be much better for shy fish, rather than something bright and glarey. Though, it reflects less light up into plants.