substrate depthsand

Hi I have a small (64L) aquarium that has been established for 4 years. It has black sand as the substrate but it is quite thin - only about 1.5" deep. I would like to add some more so that plants can be rooted more deeply so I have bought some Caribsea sand. No rinsing is appealing! If I...

Please see this project for more information about what is underneath the sand.  This link will take you direct to the section re: the sand if you want to jump straight to it.   Last night I washed and placed the sand in the front of the aquarium in the above project (photos will be added to the...