Join Date: Jan 2008
Location: Bangalore, India
I used some Quartz, They eventually became algae magnets. Not worth the trouble and it looked out of place in the aquarium with algae on it. Cleaning the crystals once they were permanently removed was also a pain. This was my experience... It depends on the crystal and what you are trying to achieve.
My Plan was crystals on sand with a black background and crystal clear water. To make it appear almost like fish were floating in thin air. I could maintain this only for a few days using seachem puragen, resins(to remove hardness) and additives to scrub the water and make it appear crystal clear, too much work. So I quickly dropped the idea and rescaped the tank.