I purchased several packages of these. I drop them into the tank and they fall randomly ontop of the gravel. They give sparkle to the decor. They are easily washed and may be used over and over. Many different colors are available for your choosing. They won't alter your tank water in any way and they are at the low cost end for purchasing.

Pros: Affordable

Cons: never enough

I love to put these on top of the regular fish stone. They are a vibrant color and really accent the aquarium. Of course, I have an over grown goldfish that tries to move these stones-I think it's bored!

Pros: Adds accent color

Cons: NONE