[turbosaurus]

Lightness as in color? or density/buoyancy?

Just make sure to rinse it really well before adding it to your tank. It takes some time to do, but is worth it.

 

[turbosaurus]

http://www.plantedtank.net/forums/substrate/47555-soilmaster-2.html

take a look at this members heartache over not rinsing. I think it is worth it.