I'm not familiar with the Jean Jaubert system so I can't really comment on it's specifics... but the thought of a plenum in the middle of the DSB
confuses me a little... can you point us to some info on the Jean Jaubert system... I'd like to read up on it and see what it's intentions are.
As far as the best type of sand, you deffintly want argonite sand, which basically means it's not silicat sand. The best way to accumulate the majority of your sand bed is by going to Home Depot or such and look for Southdown play sand. This goes by a few different names, Southdown, Carribean Play sand by Old Castle and Yard Right play sand. This is argonite sand and is used by countless folks for their aquariums (don't be fooled by the warningon the bag that read, "not recommended for aquarium use")
for your LS
, there isn't really a "type" of LS
, but diversity is what you want to strive for. See if there are a couple different LFS
in your area that sell LS
and get a few pounds from each. See if there are other aquarium keepers in your area that might be willing to give you some. You really only need enough LS
to top off the dry sand that makes up the bulk of your DSB
. the LS
will seed the rest of the sand quickly.